Outputs a vector of person locations, one for each row in the dataframe.
Usage
RIestThetasOLD(data, itemParams, method = "WL", theta_range = c(-10, 10))
Arguments
- data
Dataframe with response data only (no demographics etc), items as columns
- itemParams
Optional item (threshold) location matrix
- method
Estimation method (defaults to "WL")
- theta_range
Range of theta (person location) values
Details
Uses thetaEst() function from catR package to estimate person locations
(thetas) for a dataframe with item data as columns and persons as rows.
Defaults to use WL estimation (lower bias than ML, see Warm, 1989).
A version for multi-core processing is available as RIestThetasCATr2().