Causal inference design audit for the sewage-house-prices project. Runs a 4-phase review (claim identification, design validity, inference, polish) covering hedonic pricing, repeat sales, long difference, DiD/event studies, upstream/downstream, and dry spill strategies. This skill should be used when asked to "check the econometrics", "audit the identification", "review the strategy", or when verifying that code matches the stated design.
SkillScore48Maintained
Automatic
◆Research pack
Last verified 8/9/2026
What it changes
Passed 5 of 11 test cases with the skill, and 4 of 11 without it.
Without skill39%
With skill48%
Checks it passed that the model alone missed
Lists SOUND as an allowed assessment rating
Identifies spill_count as treatment variable
Targets manuscript sections in docs/overleaf/*.tex
and 4 more in the full report
5 fixed6 passed either way9 still failing3 broke
Pass-rate lift
+9 pp
Tokens
+20%
Agent turns
0%
Response time
-47%
Model gemini-3.6-flashMeasured 8/9/2026v111 of 23 cases passed with skill · 11 comparable
Tokens, turns and time describe resource use, not a dollar price.
See it in action
One of 5 test cases the skill fixed. Same model, same prompt, with and without the skill.
1 of 5
Prompt
What are the allowed summary ratings for the Overall Assessment section in the audit summary output?
What was checked, without and with the skill
Checked
Without skill
With skill
Lists SOUND as an allowed assessment rating
Missed
Passed
Lists CRITICAL ERRORS as an allowed assessment rating
Missed
Passed
case-20 · gemini-3.6-flash · 8/9/2026 · answers are capped and redacted
What's inside
The instructions your model reads when the skill loads.
SKILL.md145 linessingle file
Econometrics Check
Run a 4-phase causal inference audit on the target file(s) for the sewage-house-prices project.
Input:$ARGUMENTS — a .tex file, .R script, directory path, or all.
Project-Specific Context
Identification Strategies in This Paper
Hedonic regressions — Cross-sectional: log(price) on spill count/hours (continuous + bins), LSOA FE, heteroskedasticity-robust SE
Repeat sales — Within-property variation (Palmquist 1982), house fixed effects
Long difference — 250m grid-level changes, weighted/unweighted, all/exposed grids
News/media DiD — Google Trends and LexisNexis media coverage as treatment
Upstream/downstream — Directional spillover via PostGIS river network topology
Dry spills — Spills occurring without rainfall as identification variation (rainfall threshold-based)
Key Variables
Outcome: log(price) for sales, log(rent) for rentals