person_par.CRSM: Estimation of person parameters

Description

This function performs the estimation of person parameters for the multidimensional polytomous Rasch model or the continuous Rating Scale model.

Usage

# S3 method for CRSM
person_par(object, ...)
# S3 method for MPRM
person_par(object, ..., set0 = FALSE)
person_par(object, ...)

Arguments

object

Object of class MPRM or CRSM

…

set0

if set0=TRUE for those raw scores patterns with 0 observations (except in the reference category) the person parameter value is set minimal. With this procedure it is possible to estimate at least the remaining person parameters of these raw score pattern. Note: only relevant for person parameter estimation of MPRM. The person parameters for each raw score vector are constrained to sum zero

Value

ptable

table showing for each (observed) raw score the corresponding estimated person parameter and standard error

pparList

for each person raw score, estimated person parameter and the standard error is displayed

fun_calls

number of function calls

call

function call

Details

The estimation is performed by Maximum Likelihood Estimation. Thus, parameters for extreme scores are not calculated!

References

Fischer, G. H. (1974). Einfuehrung in die Theorie psychologischer Tests [Introduction to test theory]. Bern: Huber.