data.pars1.rasch

data.pars1.2pl

The datasets contains item parameters to be prepared for linking
using the function <code><a href="/link/linking.haberman?package=sirt&version=0.36-30" rd-options="" data-mini-rdoc="sirt::linking.haberman">linking.haberman</a></code>.

datasets


    Supplementary item response theory models 
    to complement existing functions in R. 

Alexander Robitzsch

sirt

Supplementary Item Response Theory Models

data.pars1.rasch function

The format of <code>data.pars1.rasch1</code> is:

<code>'data.frame':   22 obs. of  4 variables:</code> <code>$ study: chr  "study1" "study1" "study1" "study1" ...</code> <code>$ item : Factor w/ 12 levels "M133","M176",..: 1 2 3 4 5 1 6 7 3 8 ...</code> <code>$ a    : num  1 1 1 1 1 1 1 1 1 1 ...</code> <code>$ b    : num  -1.5862 0.40762 1.78031 2.00382 0.00862 ...</code>

Item slopes <code>a</code> are fixed to 1 in 1PL estimation. Item difficulties
are denoted by <code>b</code>. The format of <code>data.pars1.2pl</code> is:

<code>'data.frame':   22 obs. of  4 variables:</code> <code>$ study: chr  "study1" "study1" "study1" "study1" ...</code> <code>$ item : Factor w/ 12 levels "M133","M176",..: 1 2 3 4 5 1 6 7 3 8 ...</code> <code>$ a    : num  1.238 0.957 1.83 1.927 2.298 ...</code> <code>$ b    : num  -1.16607 0.35844 1.06571 1.17159 0.00792 ...</code>

data.pars1.rasch: Item Parameters for 3 Studies Obtained by 1PL and 2PL Estimation

Description

Usage

Arguments

format