paramA1 {lazy.irt}R Documentation

Item Parameter Data Frame # 1. (10 items of all types)

Description

Item Parameter Data Frame # 1. (10 items of all types)

Usage

paramA1

Format

A data frame with 7 rows and 6 variables.

name

character: Item name

type

character: Item type

ncat

num: # of categories: 2 for binary items

p1

num: First item parameter: slope: a

p2

num: 2nd item parameter: threshold: b1

p3

num: 3rd item parameter: threshold: b2 or c-parameter

p4

num: 4th item parameter: threshold: b3

Details

name type ncat   p1      p2      p3      p4
  Q1    B    2  1.0     0.0    0.0
  Q2    B3   2  1.0     0.0    0.2
  Q3    Bn   2  1.0     0.0    0.0
  Q4    Bn3  2  1.0     0.0    0.2
  Q5    P    3  1.0    -1.0    1.0
  Q6    G    3  1.0664 -1.0288 1.0288
  Q7    Gn   3  1.0819 -1.0221 1.0221
  Q8    P    4 0.8000 -2.0000 0.0000 2.0000
  Q9    G    4 0.9179 -2.0495 0.0000 2.0495
 Q10   Gn    4 0.9396 -2.0245 0.0000 2.0245
  


item type = all types
ncat is the max # of categories


The type P item was converted to type G and Gn items using fitG2P_ls and fitGn2P_ls functions, resp, so that the icrfs of type G and Gn items are as close as the irf of type P item.

Source

Generated by author.


[Package lazy.irt version 0.1.3 Index]