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diff-in-diff

diff-in-diff is a skill for Claude Code, Codex from sankalpsharmaa/claude-config-public. It costs 31 tokens per session (5,226 once invoked), scanned A, original, no licence file.

A guide to difference-in-differences, a research method that compares changes over time between groups affected by an intervention and groups that were not.

In plain words
What is it for?
It is for evaluating policy or treatment effects, defending parallel-trends assumptions, and correcting staggered-adoption two-way fixed-effects analyses.
Why use it?
It helps choose an estimator and address common problems such as an unsupported parallel-trends assumption or bias from adoption at different times.

Skill for Claude CodeCodex

Which agent this was written for is unclear — body not stored (licence); the path alone says nothing.

not rated 5repo 19d ago A scan 31 tokens no licence

Good fit It is for evaluating policy or treatment effects, defending parallel-trends assumptions, and correcting staggered-adoption two-way fixed-effects analyses.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/sankalpsharmaa/claude-config-public/diff-in-diff
View source ↗ sankalpsharmaa/claude-config-public
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent
npx skills add sankalpsharmaa/claude-config-public --skill diff-in-diff
Clone the repo
git clone --depth 1 https://github.com/sankalpsharmaa/claude-config-public

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for diff-in-diff

README.md
[![agentmods](https://agentmods.dev/badge/skills/sankalpsharmaa/claude-config-public/diff-in-diff/github.svg)](https://agentmods.dev/skills/sankalpsharmaa/claude-config-public/diff-in-diff)
Your own site
<a href="https://agentmods.dev/skills/sankalpsharmaa/claude-config-public/diff-in-diff"><img src="https://agentmods.dev/badge/skills/sankalpsharmaa/claude-config-public/diff-in-diff/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for diff-in-diff

Your own site · 80×15
<a href="https://agentmods.dev/skills/sankalpsharmaa/claude-config-public/diff-in-diff"><img src="https://agentmods.dev/badge/skills/sankalpsharmaa/claude-config-public/diff-in-diff.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 31 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 5,226 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin unknown No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00031 $0.05226
Opus 5.5 $0.00012 $0.02090
Sonnet 5.5 $0.00006 $0.01045
Haiku 4.5 $0.00003 $0.00523

Measured 19d ago against content hash 455202e2d21c, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

diff-in-diff scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 19d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

skills/diff-in-diff/SKILL.md · 226 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

Read it on GitHub

Files

What ships with it

43 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 19d ago First seen · 226 lines · 31 tokens per session scan A 455202e2d21c

Subscribe to this mod's changes

diff-in-diff is a skill published in the GitHub repository sankalpsharmaa/claude-config-public (5 stars, last pushed 19d ago), with no licence file. It adds 31 tokens to every session and 5,226 once invoked, about $0.0001 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-10-19.

Analytics and metricsScientific
Related

diff-in-diff compared with skills from other repositories

diff-in-diff next to 6 skills from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
diff-in-diffsankalpsharmaa/claude-config-publicSkill519d agononeA31Claude Code, Codex
instrument-data-to-allotropeanthropics/knowledge-work-pluginsSkill35k2d agoApache-2.0A123Claude Code
exploratory-data-analysisK-Dense-AI/scientific-agent-skillsSkill56k4d agoMITA83Claude Code
matlabK-Dense-AI/scientific-agent-skillsSkill56k4d agoMITA44Claude Code
phylogeneticsK-Dense-AI/scientific-agent-skillsSkill56k4d agoMITA71Claude Code, Codex
research-engineerdavila7/claude-code-templatesSkill33kyesterdayMITA43Claude Code, Codex
mapping-to-snomedmaziyarpanahi/openmedSkill5.8kyesterdayApache-2.0A205Claude Code