Individual skill
reliability-validity-testing
Evaluating measurement quality — test-retest, inter-rater agreement, and construct validity evidence.
skills/reliability-validity-testing/SKILL.md
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## Overview
reliability-validity-testing is the applied companion to psychometrics: the concrete procedures for
demonstrating that a measure is consistent (reliability) and measures what it claims (validity).
It covers designing reliability studies, choosing agreement coefficients, gathering validity
evidence, and interpreting the numbers — including what to do when they're disappointing.
Use this when you need to evaluate or defend a measurement instrument; use psychometrics for
building scales and latent-variable modeling.
## When to use
- Planning a test-retest reliability study: interval, sample size, ICC model choice.
- Inter-rater agreement: training raters, choosing kappa vs ICC vs percent agreement.