Person location estimation — RIestThetas • easyRasch

Outputs a dataframe of person locations (theta) and measurement error (SEM) for each person

Usage

RIestThetas(data, method = "WLE")

data: Dataframe with response data only (no demographics etc), items as columns
method: Estimation method (defaults to "WLE")

IMPORTANT: only use with complete response data. If you have missing item responses RIestThetasCATr() or RIestThetasOLD() is recommended instead.

Uses iarm::person_estimates() to estimate person locations (thetas) for a dataframe with item data as columns and persons as rows.

Defaults to use WLE estimation (lower bias than MLE, see Warm, 1989; Kreiner, 2025) and PCM.

Note: If you want to use a pre-specified set of item parameters, please use RIestThetasCATr() or RIestThetasOLD().