Individual skill
psychometrics
Psychological measurement — scale construction, factor analysis, IRT, and evaluating reliability and validity.
skills/psychometrics/SKILL.md
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## Overview
psychometrics is the science of measuring psychological constructs: building questionnaires and
tests, and proving they measure what they claim. It covers classical test theory, factor analysis
(exploratory and confirmatory), item response theory, and the reliability/validity evidence that
separates a real instrument from a pile of Likert items.
Anyone using a scale — for research, clinical screening, or hiring — needs the psychometric
evidence behind it. A scale without published reliability and validity is an opinion with numbers.
## When to use
- Evaluating whether an existing scale is fit for your purpose and population.
- Developing a new scale: item writing, piloting, item analysis.