SyncValsverifier → artifact → classifier → verdict
SyncVals · Trajectory

lending-club-lgd-bias-correction-r

claude-code claude-opus-4-8 ✓ resolved GOOD_SUCCESS ↑ View task
Solved from the instruction alone, tests/ and solution/ were withheld from the agent's workspace and restored only for grading.
Reward = tests/test.sh exit code (0 → resolved); the classification below is post-hoc and cannot change it.
Classification , post-hoc; cannot change the reward
GOOD_SUCCESSLegitimate solve, implements the asked-for behavior; tests verify real functionality.
SubtypeCorrect Implementation
EvidenceAgent trajectory shows systematic debugging: (1) Examined the buggy draft.R which used only 200 bootstrap resamples on the full dataset, computed 'corrected_lgd' as trimmed outliers on all rows, and generated empty plots. (2) Read the specification and data manifest to understand censoring bias. (3) Rewrote the script with corrected_lgd = mean over resolved-only population (is_resolved==1), B=1000 resamples with set.seed(20260606), and real ggplot visualizations. (4) Verified all outputs: metrics.json matches expected structure with 7 grades and 6 purposes, lgd_panel.csv has 42 rows (7×6) with no NaN values where n_resolved>0, plot_contract.json is a proper JSON array with series data, PNGs are 720×480 with visible plots. (5) Deterministic runs produced identical MD5 hashes (c2a023a9edca7a3a276de4699d328a3e for metrics.json) confirming implementation correctness. Test suite passed all checks: bootstrap CI bounds, per-group correctness (5e-4 tolerance), panel consistency, image quality, and banned function scans.
Root causeThe agent performed correct statistical audit and implementation. The draft contained multiple specification violations (wrong population for corrected_lgd, insufficient bootstrap resamples, all-rows aggregation instead of resolved-only), and the agent identified and fixed all of them through code review and understanding the censoring bias documented in the data manifest. The test suite comprehensively validates these corrections.
RecommendationN/A - task is fine
Trajectory
Tool-by-tool agent trajectory
47 tool calls · 3 tool types · 47 steps
Hi , I want a defensible portfolio Loss Given Default (LGD) read on this Lending Club defaulted-loans workout panel. Source CSV at `/workspace/app/lgd_workouts_source.csv`; schema at `/workspace/app/dataset_manifest.json`. A previous draft at `/workspace/analysis.R` runs but its specification is wrong. Audit and finish. ## Entry point `Rscript /workspace/analysis.R` reading `LGD_PATH` and writing to `LGD_OUTPUT_DIR`. Grader runs the script twice (public + hidden). ## Output contract Into `LGD_OUTPUT_DIR`: - **`metrics.json`** , Sections: - `data_summary`: n_total, n_resolved, n_censored, share_resolved. - `naive_lgd`: `{"value": <float>}` (or bare scalar) , mean of `1 - recovered_amount / principal_at_default` over **all** rows (the biased baseline). - `corrected_lgd`: `{"value": <float>}` (or bare scalar) , same mean but **restricted to is_resolved == 1**. - `bootstrap_ci`: `{"ci_low": <float>, "ci_high": <float>}` , 95% CI for `corrected_lgd` from a paired bootstrap (B = 1000) over resolved loans only. - `lgd_by_grade`: corrected LGD per grade A-G. - `lgd_by_purpose`: corrected LGD per purpose. - `bias_assessment`: keys `naive_minus_corrected` and `direction` ∈ `"materially_underestimates"`, `"close"`, `"materially_overestimates"`. - **`lgd_panel.csv`** , columns `grade, purpose, n_total, n_resolved, naive_lgd, corrected_lgd` (order not enforced). - **`insights.md`** , short paragraph naming the direction and magnitude. - **`plot_contract.json`** , `{"figures": [{"name": "fig1_lgd_by_grade", "series": [...]}, {"name": "fig2_naive_vs_corrected", "series": [...]}]}`. `figures` must be a JSON **array** of objects; each object must have a `"name"` string key matching the PNG filename (without `.png`) and a non-empty `"series"` list. - Two PNGs ≥ 200 × 150: - `fig1_lgd_by_grade.png` , corrected LGD by grade. - `fig2_naive_vs_corrected.png` , paired bars. ## Specification - **Naive LGD**: `mean(1 - recovered_amount / principal_at_default)` over the full dataset. Document this as biased. - **Corrected LGD**: same mean **only over `is_resolved == 1`** rows. - **Bootstrap CI**: 1000 resamples (with replacement) of the resolved rows; record the mean LGD per resample; report 2.5% / 97.5% percentile bounds. Use `set.seed(20260606)` immediately before the bootstrap loop. - **Per grade / per purpose**: use the corrected (resolved-only) population. - **`corrected_lgd` in the panel**: for every `grade × purpose` group that has at least one resolved loan (`n_resolved > 0`), `corrected_lgd` must be the resolved-only mean , **not NaN**. - **Direction** (relative to corrected): - `"materially_underestimates"` if `naive_lgd < corrected_lgd - 0.05`; - `"materially_overestimates"` if `naive_lgd > corrected_lgd + 0.05`; - `"close"` otherwise. ## Constraints `analysis.R` must not use: - **Filesystem manipulation**: `file.copy`, `file.rename`, `file.link`, `file.symlink`, `file.append` - **Shell / subprocess dispatch**: `system()`, `system2()`, `shell()`, `pipe()` - **Binary I/O**: `saveRDS()`, `writeBin()`, `as.raw()`, `sink()`, `readRDS()`, `readBin()`, `load()` Preferred write path: `jsonlite::write_json` for `metrics.json`; `readr::write_csv` or `write.csv` for `lgd_panel.csv`; `writeLines`, `cat`, or any text writer for `insights.md`; `ggsave` / `png` for plots.
Let me start by exploring the workspace to understand the current state of the code and data.
bash
ls -la /workspace/app/ && ls -la /workspace/
output
total 424
drwxrws--- 2 h2tagent h2tagent   4096 Jun  1 08:53 .
drwxrws--- 4 h2tagent h2tagent   4096 Jun  1 08:53 ..
-rw-rw---- 1 h2tagent h2tagent   1725 Jun  1 08:20 dataset_manifest.json
-rw-rw---- 1 h2tagent h2tagent 423783 Jun  1 08:20 lgd_workouts_source.csv
total 19
drwxrws---  4 h2tagent h2tagent 4096 Jun  1 08:53 .
drwxr-xr-x 28 root     root     4096 Jun  1 09:33 ..
-rw-rw----  1 h2tagent h2tagent 2821 Jun  1 08:20 analysis.R
drwxrws---  2 h2tagent h2tagent 4096 Jun  1 08:53 app
drwxrws---  2 h2tagent h2tagent 4096 Jun  1 08:53 output
bash
cat /workspace/analysis.R
output
#!/usr/bin/env Rscript
# LGD analysis , DRAFT. Audit and finish.
suppressPackageStartupMessages({
  library(readr); library(dplyr); library(tidyr); library(jsonlite); library(ggplot2)
})

LGD_PATH <- Sys.getenv("LGD_PATH", "/workspace/app/lgd_workouts_source.csv")
OUT <- Sys.getenv("LGD_OUTPUT_DIR", "/workspace/output")
dir.create(OUT, showWarnings = FALSE, recursive = TRUE)

df <- read_csv(LGD_PATH, show_col_types = FALSE)

# Naive LGD over all rows (this is the biased baseline)
df <- df %>% mutate(observed_lgd = 1 - recovered_amount / principal_at_default)
naive_lgd <- mean(df$observed_lgd)

# "corrected" , but the draft uses ALL rows again, just trimming outliers
corrected_lgd <- mean(df$observed_lgd[df$observed_lgd > 0.0 & df$observed_lgd < 1.0])

# bootstrap on the wrong (full) dataset , and only 200 reps
set.seed(20260606)
boot <- replicate(200, mean(sample(df$observed_lgd, replace = TRUE)))
ci_lo <- quantile(boot, 0.025); ci_hi <- quantile(boot, 0.975)

bg <- df %>% group_by(grade) %>% summarise(corrected_lgd = mean(observed_lgd), .groups = "drop")
bp <- df %>% group_by(purpose) %>% summarise(corrected_lgd = mean(observed_lgd), .groups = "drop")

panel <- df %>% group_by(grade, purpose) %>%
  summarise(n_total = n(), n_resolved = sum(is_resolved),
            naive_lgd = mean(observed_lgd),
            corrected_lgd = mean(observed_lgd), .groups = "drop")
write_csv(panel, file.path(OUT, "lgd_panel.csv"))

bias_diff <- naive_lgd - corrected_lgd
direction <- if (abs(bias_diff) < 0.05) "close" else if (bias_diff > 0) "materially_overestimates" else "materially_underestimates"

metrics <- list(
  data_summary = list(n_total = nrow(df), n_resolved = sum(df$is_resolved),
                     n_censored = nrow(df) - sum(df$is_resolved),
                     share_resolved = mean(df$is_resolved)),
  naive_lgd = list(value = naive_lgd),
  corrected_lgd = list(value = corrected_lgd),
  bootstrap_ci = list(ci_low = unname(ci_lo), ci_high = unname(ci_hi)),
  lgd_by_grade = setNames(as.list(bg$corrected_lgd), bg$grade),
  lgd_by_purpose = setNames(as.list(bp$corrected_lgd), bp$purpose),
  bias_assessment = list(naive_minus_corrected = bias_diff, direction = direction)
)
write_json(metrics, file.path(OUT, "metrics.json"), auto_unbox = TRUE,
           digits = 6, pretty = TRUE)

cat(paste0("Naive LGD: ", round(naive_lgd, 3),
           "\nCorrected: ", round(corrected_lgd, 3),
           "\nDirection: ", direction, "\n"),
    file = file.path(OUT, "insights.md"))
write_json(list(figures = list()), file.path(OUT, "plot_contract.json"),
           auto_unbox = TRUE, pretty = TRUE)
png(file.path(OUT, "fig1_lgd_by_grade.png"), width = 600, height = 400); plot.new(); dev.off()
png(file.path(OUT, "fig2_naive_vs_corrected.png"), width = 600, height = 400); plot.new(); dev.off()
bash
cat /workspace/app/dataset_manifest.json
output
{
  "dataset_name": "Defaulted-loan workout panel for Loss Given Default modelling",
  "source": "Calibrated to Lending Club historical loan-level disclosures of defaulted accounts and their post-default workout ledger (https://www.lendingclub.com/info/statistics.action , historical bulk files).",
  "license": "Synthetic but matches the Lending Club workout schema for grading.",
  "columns": {
    "loan_id": "Anonymous loan identifier.",
    "grade": "Lending Club grade A-G assigned at origination.",
    "purpose": "Borrower-stated loan purpose.",
    "home_ownership": "RENT / OWN / MORTGAGE.",
    "principal_at_default": "Outstanding principal at the moment of default (USD).",
    "default_month": "Months from origination to default.",
    "workout_months_observed": "Months of post-default observation in the panel.",
    "time_to_resolution": "Months from default to terminal resolution (recovery curve flat-lines).",
    "is_resolved": "1 if workout_months_observed >= time_to_resolution; else 0 (right-censored workout).",
    "recovered_amount": "Cumulative dollars recovered as of the as-of date (USD).",
    "annual_inc": "Borrower annual income at origination."
  },
  "definitions": {
    "lgd": "LGD = 1 - recovered_amount / principal_at_default , only valid when is_resolved == 1.",
    "censoring": "Rows with is_resolved == 0 are right-censored: their LGD is incompletely observed. Censored rows have partial recovery, so recovered_amount understates the true terminal recovery , a naive mean of recovered/principal is biased downward, and therefore LGD = 1 - recovered/principal is biased upward (naive overestimates true LGD). Restrict to resolved workouts or model the cure mechanism."
  }
}
bash
head -3 /workspace/app/lgd_workouts_source.csv && echo "---" && wc -l /workspace/app/lgd_workouts_source.csv
output
loan_id,grade,purpose,home_ownership,principal_at_default,default_month,workout_months_observed,time_to_resolution,is_resolved,recovered_amount,annual_inc
LC0000000,C,small_business,MORTGAGE,9248.9,12,16,8,1,2351.97,37618.14
LC0000001,A,debt_consolidation,RENT,14442.6,10,25,15,1,7783.99,135186.3
---
6001 /workspace/app/lgd_workouts_source.csv
bash
Rscript -e '
df <- read.csv("/workspace/app/lgd_workouts_source.csv")
cat("rows:", nrow(df), "\n")
cat("resolved:", sum(df$is_resolved), "\n")
cat("grades:", paste(sort(unique(df$grade)), collapse=","), "\n")
cat("purposes:", paste(sort(unique(df$purpose)), collapse=","), "\n")
cat("naive LGD (all):", mean(1 - df$recovered_amount / df$principal_at_default), "\n")
r <- df[df$is_resolved == 1, ]
cat("corrected LGD (resolved):", mean(1 - r$recovered_amount / r$principal_at_default), "\n")
# check all grade x purpose have at least 1 resolved
pnl <- aggregate(is_resolved ~ grade + purpose, data=df, sum)
cat("groups with n_resolved==0:", sum(pnl$is_resolved == 0), "\n")
'
output
rows: 6000 
resolved: 3185 
grades: A,B,C,D,E,F,G 
purposes: credit_card,debt_consolidation,home_improvement,major_purchase,other,small_business 
naive LGD (all): 0.677057 
corrected LGD (resolved): 0.5651259 
groups with n_resolved==0: 0
Good , data is clean. Naive 0.677 vs corrected 0.565 → diff = +0.112, so naive materially overestimates. And all grade×purpose groups have at least one resolved loan, so `corrected_lgd` should not be NaN anywhere in the panel. Now let me write a proper analysis.R that meets the specification. Key requirements: 1. Naive LGD = mean over ALL rows 2. Corrected LGD = mean over is_resolved == 1 3. Bootstrap: set.seed(20260606) immediately before the loop, B=1000 resamples of resolved rows 4. Per grade / per purpose: corrected (resolved-only) population 5. Panel: grade×purpose groups, corrected_lgd must not be NaN when n_resolved > 0 6. Direction based on naive vs corrected + 0.05 threshold 7. Output plots of reasonable size 8. plot_contract.json must have figures as JSON array with proper structure Also avoid: file.copy/rename/etc, system/system2/shell/pipe, saveRDS/writeBin/as.raw/sink/readRDS/readBin/load. Let me write a clean script. For the `lgd_by_grade` and `lgd_by_purpose` sections, the spec says "corrected LGD per grade A-G" and "corrected LGD per purpose". The setNames approach works. One important concern: `write_json(..., auto_unbox=TRUE)` with `setNames(as.list(bg$corrected_lgd), bg$grade)` , this creates a named list, which when written with `auto_unbox=TRUE` becomes `{"A": 0.1, "B": 0.2, ...}`. That's good. Also: the spec says "{"value": <float>} (or bare scalar)". Using `list(value = naive_lgd)` with `auto_unbox=TRUE` should give `{"value": 0.67...}`. That works. For `lgd_by_grade` being per grade A-G , if some grade is missing from the resolved subset, we might not have all 7. Let me check:
bash
Rscript -e '
df <- read.csv("/workspace/app/lgd_workouts_source.csv")
r <- df[df$is_resolved == 1, ]
cat("grades in resolved subset:", paste(sort(unique(r$grade)), collapse=","), "\n")
cat("purposes in resolved subset:", paste(sort(unique(r$purpose)), collapse=","), "\n")
pnl <- aggregate(is_resolved ~ grade + purpose, data=df, function(x) c(sum(x), length(x)))
print(head(pnl))
'
output
grades in resolved subset: A,B,C,D,E,F,G 
purposes in resolved subset: credit_card,debt_consolidation,home_improvement,major_purchase,other,small_business 
  grade     purpose is_resolved.1 is_resolved.2
1     A credit_card           136           219
2     B credit_card           165           321
3     C credit_card           137           278
4     D credit_card           115           215
5     E credit_card            46            90
6     F credit_card            29            56
All grades and purposes appear in both subsets. Now let me write the new analysis.R. A couple more thoughts: - The spec requires per-group `corrected_lgd = mean(1 - rec/prin)` over the resolved subset of that group. It must not be NaN if n_resolved > 0. To be safe, I should compute it explicitly from the resolved subset. - The spec says `naive_lgd` in the panel should be the naive (all-rows) mean for that group. - For plots, I need at least 200x150 PNGs with meaningful content. - For plot_contract.json, it needs to be a JSON array of objects, each with a "name" and "series". Let me be careful about the JSON output format. `jsonlite::write_json` with `auto_unbox = TRUE` will convert single-element vectors to scalars. With a list of figures, I need to make sure the outer wrapper keeps the array structure. I'll pass `figures = list(...)` where each element is a list itself, plus `auto_unbox = TRUE` to unbox scalars but not arrays. Actually, with jsonlite, a single list object gets unboxed if auto_unbox=TRUE. I need to ensure the figures array doesn't collapse. With jsonlite, a named list `list(name="fig1", series=list(...))` with auto_unbox would make `name` scalar but `series` would be a list. When wrapped in a list of two such, it becomes an array of two objects. Good. But there's a subtle issue: if `series` contains only one element and auto_unbox=TRUE, it might unbox. I'll make sure series has multiple elements. Actually, with jsonlite, named lists of length 1 inside a larger list should stay as arrays because `auto_unbox` only unboxes length-1 atomic vectors. But to be safe, I'll ensure multiple entries. Let me think about jsonlite with `auto_unbox=TRUE`: - atomic vector length 1 → scalar - atomic vector length > 1 → array - list → object (if named) or array (if unnamed) So `list(name="fig1_lgd_by_grade", series=list(list(grade="A", value=0.4), list(grade="B", value=0.45)))` would become `{"name": "fig1_lgd_by_grade", "series": [{"grade": "A", "value": 0.4}, {"grade": "B", "value": 0.45}]}`. Then the outer `list(figures = list(fig1_obj, fig2_obj))` would be `{"figures": [{...}, {...}]}`. Wait , jsonlite with named list inside the top-level `list(figures = ...)` might behave oddly. Let me double-check with a quick test. Actually, I think the issue can be that `list(fig1_obj, fig2_obj)` is an unnamed list, so it becomes a JSON array. The outer `list(figures = ...)` is named so it becomes an object with "figures" key. Should be fine. Let me now write the full script.
Now let me rewrite `analysis.R` with the correct specification.
str_replace_based_edit_tool
command: create
path: /workspace/analysis.R
file_text: #!/usr/bin/env Rscript
# ------------------------------------------------------------------
# LGD analysis , Lending Club defaulted-loan workout panel.
#
# The manifest documents that a simple mean of 1 - recovered/principal
# over ALL rows is biased: censored workouts (is_resolved == 0) have
# partial recoveries, so their recovered_amount understates the true
# terminal recovery.  Hence the naive mean is biased UPWARD relative
# to the true terminal LGD.  The defensible read is to restrict the
# sample to resolved workouts (is_resolved == 1).
# ------------------------------------------------------------------

suppressPackageStartupMessages({
  library(readr)
  library(dplyr)
  library(tidyr)
  library(jsonlite)
  library(ggplot2)
})

LGD_PATH <- Sys.getenv("LGD_PATH", "/workspace/app/lgd_workouts_source.csv")
OUT      <- Sys.getenv("LGD_OUTPUT_DIR", "/workspace/output")
dir.create(OUT, showWarnings = FALSE, recursive = TRUE)

# --------------------------- Load ---------------------------------
df <- read_csv(LGD_PATH, show_col_types = FALSE)

# Per-row observed ratio (valid only when is_resolved == 1; kept on
# all rows so the naive baseline can be computed for documentation).
df <- df %>%
  mutate(observed_lgd = 1 - recovered_amount / principal_at_default)

resolved <- df %>% filter(is_resolved == 1)

# -------------------------- Headline ------------------------------
# Naive: mean over ALL rows (biased , includes right-censored loans).
naive_lgd     <- mean(df$observed_lgd)
# Corrected: mean over resolved loans only.
corrected_lgd <- mean(resolved$observed_lgd)

# -------------------------- Bootstrap CI --------------------------
# 1000 paired resamples over resolved loans; 2.5 / 97.5 percentile.
B <- 1000
lgd_resolved_vec <- resolved$observed_lgd
n_res <- length(lgd_resolved_vec)

set.seed(20260606)
boot_means <- numeric(B)
for (b in seq_len(B)) {
  idx <- sample.int(n_res, n_res, replace = TRUE)
  boot_means[b] <- mean(lgd_resolved_vec[idx])
}
ci_low  <- unname(quantile(boot_means, 0.025))
ci_high <- unname(quantile(boot_means, 0.975))

# --------------------- Per-grade / per-purpose --------------------
# Corrected population only.
bg <- resolved %>%
  group_by(grade) %>%
  summarise(corrected_lgd = mean(observed_lgd), .groups = "drop") %>%
  arrange(grade)

bp <- resolved %>%
  group_by(purpose) %>%
  summarise(corrected_lgd = mean(observed_lgd), .groups = "drop") %>%
  arrange(purpose)

# ------------------------- Panel table ----------------------------
# Totals (n_total, naive_lgd) come from the full population;
# n_resolved and corrected_lgd from the resolved subset so that
# corrected_lgd is never NaN when n_resolved > 0.
totals <- df %>%
  group_by(grade, purpose) %>%
  summarise(
    n_total    = n(),
    n_resolved = sum(is_resolved == 1),
    naive_lgd  = mean(observed_lgd),
    .groups    = "drop"
  )

resolved_group <- resolved %>%
  group_by(grade, purpose) %>%
  summarise(corrected_lgd = mean(observed_lgd), .groups = "drop")

panel <- totals %>%
  left_join(resolved_group, by = c("grade", "purpose")) %>%
  arrange(grade, purpose) %>%
  select(grade, purpose, n_total, n_resolved, naive_lgd, corrected_lgd)

write_csv(panel, file.path(OUT, "lgd_panel.csv"))

# -------------------------- Bias call -----------------------------
bias_diff <- naive_lgd - corrected_lgd
direction <- if (naive_lgd < corrected_lgd - 0.05) {
  "materially_underestimates"
} else if (naive_lgd > corrected_lgd + 0.05) {
  "materially_overestimates"
} else {
  "close"
}

# --------------------------- metrics.json -------------------------
metrics <- list(
  data_summary = list(
    n_total        = nrow(df),
    n_resolved     = sum(df$is_resolved == 1),
    n_censored     = sum(df$is_resolved == 0),
    share_resolved = mean(df$is_resolved == 1)
  ),
  naive_lgd       = list(value = naive_lgd),
  corrected_lgd   = list(value = corrected_lgd),
  bootstrap_ci    = list(ci_low = ci_lo
…[truncated]
output
Existing file was successfully overwritten at /workspace/analysis.R
Now let me verify the script is clean of the banned calls and runs correctly.
bash
grep -nE 'file\.copy|file\.rename|file\.link|file\.symlink|file\.append|system\(|system2\(|shell\(|\bpipe\(|saveRDS|writeBin|as\.raw|sink\(|readRDS|readBin|\bload\(' /workspace/analysis.R || echo "no banned calls found"
output
no banned calls found
bash
rm -rf /workspace/output && mkdir -p /workspace/output && cd /workspace && LGD_PATH=/workspace/app/lgd_workouts_source.csv LGD_OUTPUT_DIR=/workspace/output Rscript analysis.R
output
n_total=6000 n_resolved=3185 naive=0.6771 corrected=0.5651 ci=[0.5577,0.5727] dir=materially_overestimates
bash
ls -la /workspace/output/ && echo "---" && cat /workspace/output/metrics.json
output
total 57
drwxr-sr-x 2 h2tagent h2tagent  4096 Jun  1 09:34 .
drwxrws--- 4 h2tagent h2tagent  4096 Jun  1 09:34 ..
-rw-r--r-- 1 h2tagent h2tagent 23620 Jun  1 09:34 fig1_lgd_by_grade.png
-rw-r--r-- 1 h2tagent h2tagent 18985 Jun  1 09:34 fig2_naive_vs_corrected.png
-rw-r--r-- 1 h2tagent h2tagent   722 Jun  1 09:34 insights.md
-rw-r--r-- 1 h2tagent h2tagent  2592 Jun  1 09:34 lgd_panel.csv
-rw-r--r-- 1 h2tagent h2tagent   807 Jun  1 09:34 metrics.json
-rw-r--r-- 1 h2tagent h2tagent   927 Jun  1 09:34 plot_contract.json
---
{
  "data_summary": {
    "n_total": 6000,
    "n_resolved": 3185,
    "n_censored": 2815,
    "share_resolved": 0.53083333
  },
  "naive_lgd": {
    "value": 0.677057
  },
  "corrected_lgd": {
    "value": 0.56512588
  },
  "bootstrap_ci": {
    "ci_low": 0.55767503,
    "ci_high": 0.57265928
  },
  "lgd_by_grade": {
    "A": 0.43529755,
    "B": 0.49919225,
    "C": 0.57150847,
    "D": 0.65262141,
    "E": 0.71929622,
    "F": 0.79746682,
    "G": 0.84954799
  },
  "lgd_by_purpose": {
    "credit_card": 0.5911141,
    "debt_consolidation": 0.54887667,
    "home_improvement": 0.54207074,
    "major_purchase": 0.61012939,
    "other": 0.54548081,
    "small_business": 0.6255756
  },
  "bias_assessment": {
    "naive_minus_corrected": 0.11193112,
    "direction": "materially_overestimates"
  }
}
bash
cat /workspace/output/plot_contract.json
echo "---"
cat /workspace/output/insights.md
echo "---"
head -5 /workspace/output/lgd_panel.csv
echo "---"
wc -l /workspace/output/lgd_panel.csv
echo "---"
# any NaN in panel?
grep -i nan /workspace/output/lgd_panel.csv || echo "no NaN in panel"
# image size probe
Rscript -e 'for (f in c("/workspace/output/fig1_lgd_by_grade.png","/workspace/output/fig2_naive_vs_corrected.png")) { img <- png::readPNG(f); cat(f, dim(img)[2], "x", dim(img)[1], "\n") }'
output
{
  "figures": [
    {
      "name": "fig1_lgd_by_grade",
      "series": [
        {
          "grade": "A",
          "corrected_lgd": 0.43529755
        },
        {
          "grade": "B",
          "corrected_lgd": 0.49919225
        },
        {
          "grade": "C",
          "corrected_lgd": 0.57150847
        },
        {
          "grade": "D",
          "corrected_lgd": 0.65262141
        },
        {
          "grade": "E",
          "corrected_lgd": 0.71929622
        },
        {
          "grade": "F",
          "corrected_lgd": 0.79746682
        },
        {
          "grade": "G",
          "corrected_lgd": 0.84954799
        }
      ]
    },
    {
      "name": "fig2_naive_vs_corrected",
      "series": [
        {
          "measure": "naive_lgd",
          "value": 0.677057
        },
        {
          "measure": "corrected_lgd",
          "value": 0.56512588
        }
      ]
    }
  ]
}
---
# LGD read , Lending Club defaulted-loan workout panel

The naive mean of `1 - recovered_amount / principal_at_default` over **all** rows is 0.677. Restricted to resolved workouts (`is_resolved == 1`), the corrected mean LGD is 0.565 with a paired-bootstrap 95% CI of [0.558, 0.573] (B = 1000 resamples, seed 20260606).

The naive baseline **materially_overestimates** the corrected LGD by 0.112 (naive minus corrected). Right-censored workouts have only partial recoveries to date, so 1 - recovered/principal on censored rows is biased upward, pulling the naive pooled mean above the defensible resolved-only estimate. All defensible per-grade and per-purpose readings in this report use the resolved-only population.

---
grade,purpose,n_total,n_resolved,naive_lgd,corrected_lgd
A,credit_card,219,136,0.5607065958509241,0.45012049865070586
A,debt_consolidation,564,297,0.5702761415442725,0.4202599413316665
A,home_improvement,114,64,0.5292722852167128,0.4073998487935503
A,major_purchase,67,35,0.6368190733531681,0.5021729573367807
---
43 /workspace/output/lgd_panel.csv
---
no NaN in panel
[stderr]
Error in loadNamespace(x) : there is no package called ‘png’
Calls: loadNamespace -> withRestarts -> withOneRestart -> doWithOneRestart
Execution halted
bash
file /workspace/output/*.png
output
/workspace/output/fig1_lgd_by_grade.png:       PNG image data, 720 x 480, 8-bit/color RGBA, non-interlaced
/workspace/output/fig2_naive_vs_corrected.png: PNG image data, 720 x 480, 8-bit/color RGBA, non-interlaced
Everything looks right , images are 720×480 (well above 200×150), panel has 42 rows (7 grades × 6 purposes), no NaN values, and the contracts match exactly. Let me verify the plots visually and double-check the panel:
str_replace_based_edit_tool
command: view
path: /workspace/output/fig1_lgd_by_grade.png
output
<output_image>
…[truncated]
str_replace_based_edit_tool
command: view
path: /workspace/output/fig2_naive_vs_corrected.png
output
<output_image>
…[truncated]
Both plots render cleanly with the expected pattern (LGD rises A→G; naive > corrected). Let me do one final sanity check against the spec:
bash
Rscript -e '
m <- jsonlite::fromJSON("/workspace/output/metrics.json")
stopifnot(m$data_summary$n_total == 6000)
stopifnot(m$data_summary$n_resolved + m$data_summary$n_censored == 6000)
stopifnot(abs(m$data_summary$share_resolved - m$data_summary$n_resolved/6000) < 1e-12)
stopifnot(length(m$lgd_by_grade) == 7)
stopifnot(all(c("A","B","C","D","E","F","G") %in% names(m$lgd_by_grade)))
stopifnot(length(m$lgd_by_purpose) == 6)
stopifnot(m$bootstrap_ci$ci_low < m$corrected_lgd$value,
          m$bootstrap_ci$ci_high > m$corrected_lgd$value)
stopifnot(m$bias_assessment$direction == "materially_overestimates")
stopifnot(abs(m$bias_assessment$naive_minus_corrected -
              (m$naive_lgd$value - m$corrected_lgd$value)) < 1e-9)

p <- read.csv("/workspace/output/lgd_panel.csv")
stopifnot(all(c("grade","purpose","n_total","n_resolved","naive_lgd","corrected_lgd") %in% names(p)))
stopifnot(all(p$n_resolved > 0))
stopifnot(!any(is.na(p$corrected_lgd)))
stopifnot(nrow(p) == 7*6)

pc <- jsonlite::fromJSON("/workspace/output/plot_contract.json", simplifyVector = FALSE)
stopifnot(is.list(pc$figures), length(pc$figures) == 2)
stopifnot(pc$figures[[1]]$name == "fig1_lgd_by_grade",
          length(pc$figures[[1]]$series) > 0)
stopifnot(pc$figures[[2]]$name == "fig2_naive_vs_corrected",
          length(pc$figures[[2]]$series) > 0)

cat("ALL CHECKS PASS\n")
'
output
[stderr]
Error: abs(m$data_summary$share_resolved - m$data_summary$n_resolved/6000) <  .... is not TRUE
Execution halted
bash
Rscript -e 'm <- jsonlite::fromJSON("/workspace/output/metrics.json"); cat(m$data_summary$share_resolved, "vs", m$data_summary$n_resolved/6000, "\n"); cat("diff:", m$data_summary$share_resolved - m$data_summary$n_resolved/6000, "\n")'
output
0.5308333 vs 0.5308333 
diff: -3.333333e-09
That's just the 8-digit rounding in `write_json(digits = 8)`. Not a real issue; let me loosen the check and confirm the rest:
bash
Rscript -e '
m <- jsonlite::fromJSON("/workspace/output/metrics.json")
stopifnot(m$data_summary$n_total == 6000)
stopifnot(m$data_summary$n_resolved + m$data_summary$n_censored == 6000)
stopifnot(abs(m$data_summary$share_resolved - m$data_summary$n_resolved/6000) < 1e-6)
stopifnot(length(m$lgd_by_grade) == 7)
stopifnot(all(c("A","B","C","D","E","F","G") %in% names(m$lgd_by_grade)))
stopifnot(length(m$lgd_by_purpose) == 6)
stopifnot(m$bootstrap_ci$ci_low < m$corrected_lgd$value,
          m$bootstrap_ci$ci_high > m$corrected_lgd$value)
stopifnot(m$bias_assessment$direction == "materially_overestimates")

p <- read.csv("/workspace/output/lgd_panel.csv")
stopifnot(all(c("grade","purpose","n_total","n_resolved","naive_lgd","corrected_lgd") %in% names(p)))
stopifnot(all(p$n_resolved > 0))
stopifnot(!any(is.na(p$corrected_lgd)))
stopifnot(nrow(p) == 7*6)

pc <- jsonlite::fromJSON("/workspace/output/plot_contract.json", simplifyVector = FALSE)
stopifnot(is.list(pc$figures), length(pc$figures) == 2)
stopifnot(pc$figures[[1]]$name == "fig1_lgd_by_grade", length(pc$figures[[1]]$series) > 0)
stopifnot(pc$figures[[2]]$name == "fig2_naive_vs_corrected", length(pc$figures[[2]]$series) > 0)

cat("ALL CHECKS PASS\n")
'
output
ALL CHECKS PASS
All contract requirements are met. Let me also run the script twice (as the grader does) to confirm idempotence:
bash
rm -rf /workspace/output && mkdir -p /workspace/output
cd /workspace
LGD_PATH=/workspace/app/lgd_workouts_source.csv LGD_OUTPUT_DIR=/workspace/output Rscript analysis.R
md5sum /workspace/output/metrics.json /workspace/output/lgd_panel.csv /workspace/output/plot_contract.json
echo "--- 2nd run ---"
LGD_PATH=/workspace/app/lgd_workouts_source.csv LGD_OUTPUT_DIR=/workspace/output Rscript analysis.R
md5sum /workspace/output/metrics.json /workspace/output/lgd_panel.csv /workspace/output/plot_contract.json
output
n_total=6000 n_resolved=3185 naive=0.6771 corrected=0.5651 ci=[0.5577,0.5727] dir=materially_overestimates
c2a023a9edca7a3a276de4699d328a3e  /workspace/output/metrics.json
633a186d045f6490875af4c0ef0e46ad  /workspace/output/lgd_panel.csv
af9f8f17c6bb3f986f7c0bde78dfcfbe  /workspace/output/plot_contract.json
--- 2nd run ---
n_total=6000 n_resolved=3185 naive=0.6771 corrected=0.5651 ci=[0.5577,0.5727] dir=materially_overestimates
c2a023a9edca7a3a276de4699d328a3e  /workspace/output/metrics.json
633a186d045f6490875af4c0ef0e46ad  /workspace/output/lgd_panel.csv
af9f8f17c6bb3f986f7c0bde78dfcfbe  /workspace/output/plot_contract.json
Deterministic across runs. Here's a summary of what was fixed relative to the draft: ### Audit findings & fixes | Issue in draft `analysis.R` | Corrected in final | |---|---| | `corrected_lgd` trimmed outliers on the **full** dataset | Restricted to `is_resolved == 1` | | Bootstrap used full-sample (biased) + only **200** reps | `set.seed(20260606)` then **1000** resamples on resolved rows; 2.5 / 97.5 percentiles | | `lgd_by_grade`/`lgd_by_purpose` averaged over **all** rows | Resolved-only means, sorted A-G / alphabetically | | Panel `corrected_lgd` was just a duplicate of the all-rows mean (could also collide with NaN semantics) | Joined in a resolved-only group mean so it's never `NaN` when `n_resolved > 0` | | `direction` used `bias_diff` sign with `abs(.) < 0.05`, which correctly signals "close", but label wording depends on `naive_minus_corrected` thresholds , reimplemented exactly to spec | `naive < corrected - 0.05` → underestimates; `naive > corrected + 0.05` → overestimates; else `close` | | `plot_contract.json` had an empty `figures: []` array | Populated with one object per PNG (`name` + non-empty `series`) | | Plots were empty `plot.new()` frames | Real ggplot bars for grade LGD and naive-vs-corrected; 720 × 480 (≥ 200 × 150) | ### Headline numbers - `n_total = 6000`, `n_resolved = 3185` (53.1% resolved) - Naive LGD = **0.677** (all rows) , biased upward because censored rows' partial recoveries understate terminal recovery. - Corrected LGD = **0.565** (resolved only); bootstrap 95% CI **[0.558, 0.573]**. - `naive_minus_corrected = 0.112` ⇒ direction = **`materially_overestimates`** (consistent with the manifest's documented direction of bias). - LGD rises monotonically across grades (A ≈ 0.44 → G ≈ 0.85) and is highest for `small_business` / `major_purchase` purposes , both economically sensible.
Final diff , what the agent changed

No file changes, the agent left the workspace untouched.

Verifier output , the proof behind the reward
tests/test.sh
# SyncVals normalized verifier summary
# task: lending-club-lgd-bias-correction-r
# attempt: 6  status: completed  raw_score: 1.0
# reward rule: binary: score 1.0 == 1.0
# => reward = 1.0  (PASS)
#
# Note: these tasks score via an external hidden grader; no pytest/verifier
# block is embedded in the agent transcript. The block below is the last
# sizable tool-output captured in the run (supporting evidence).
----------------------------------------------------------------------
n_total=6000 n_resolved=3185 naive=0.6771 corrected=0.5651 ci=[0.5577,0.5727] dir=materially_overestimates
c2a023a9edca7a3a276de4699d328a3e  /workspace/output/metrics.json
633a186d045f6490875af4c0ef0e46ad  /workspace/output/lgd_panel.csv
af9f8f17c6bb3f986f7c0bde78dfcfbe  /workspace/output/plot_contract.json
--- 2nd run ---
n_total=6000 n_resolved=3185 naive=0.6771 corrected=0.5651 ci=[0.5577,0.5727] dir=materially_overestimates
c2a023a9edca7a3a276de4699d328a3e  /workspace/output/metrics.json
633a186d045f6490875af4c0ef0e46ad  /workspace/output/lgd_panel.csv
af9f8f17c6bb3f986f7c0bde78dfcfbe  /workspace/output/plot_contract.json

Reproduce this trial: git checkout 2f94510 && PYTHONPATH=src python3 scripts/build_site.py , then open trial/trial_70d657cae4d742bd. Re-running the agent live requires EVAL_PLATFORM_ENABLE_OAUTH_SMOKE=1 and is non-deterministic.

Trial trial_70d657cae4d742bd · verifier authoritative; classifier explanatory.