Individual skill

define-variables

Use when exposure, outcome, covariate or eligibility definitions and cutoffs need a citable basis before the protocol. Reads the data dictionary first, then maps each variable to a guideline or published definition and the database columns in a citation-backed table.

skills/define-variables/SKILL.md

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# Define-Variables Skill

Map each exposure, outcome, covariate, and eligibility variable to a canonical guideline/consensus
definition, cross-check it against prior operationalizations in comparable cohorts, then map it to
the available DB variables. Call after `/design-study` (and `/search-lit`), before
`/write-protocol`.

## Inputs

1. **Research question** (one sentence)
2. **Candidate variables** — exposure, outcome, key covariates, eligibility filters
3. **Data dictionary path** (xlsx / csv / markdown) OR explicit list of available DB columns
4. **Cohort type** (e.g., health-screening, NHANES-like, claims, registry) — informs which prior-art cohort to compare against
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