Principia

A source-graded registry of organizational measurement.

Principia is a continuously-updated, source-graded survey of organizational measurement and its Bayesian priors. For each construct family it covers, the registry records the construct itself, every instrument that has measured it, reliability and validity evidence per instrument, effect sizes linking the construct to its predictors and outcomes, and synthesized meta-analytic priors fit for direct Bayesian consumption.

Every row traces to a primary source. Nothing here is original empirical research; original work happens upstream and feeds back in. Coverage compounds; this is not exhaustive on day one.

Browse the registry

Full cross-entity search arrives with PRN-038b. For now, browse by entity type from the navigation above.

Read the explainers

Audience-tier explainers — what a construct is, why a prior matters, how to read an effect-size table — live on the editorial site:

peopleanalyst.com/research/principia

For builders

The same data is available as a REST surface at /api/v1/* (bearer-auth, per-consumer rate limits) and as an MCP gateway at /api/mcp. Priors are consumable directly as Stan / brms / PyMC distributions — see /registry/priors for the synthesized rows.