chcemat_simulate: Simulate a test or scale data matrix.
In TestGardener: Information Analysis for Test and Rating Scale Data

chcemat_simulate

R Documentation

Simulate a test or scale data matrix.

Description

Used in dataSimulation, this function sets up an N by n matrix of index values that specify the index of the option chosen by an examinee or respondent for a specific question.

Usage

  chcemat_simulate(index.pop, SfdList)

Arguments

index.pop

A vector containing population score index values at which data are to be simulated.

SfdList

A numbered list object produced by a TestGardener analysis of a test. Its length is equal to the number of items in the test or questions in the scale. Each member of SfdList is a named list containing information computed during the analysis. These named lists contain these objects:

Sfd:: A functional data object containing the M surprisal curves f. or a question.
M:: The number of options.
Pbin:: A matrix containing proportions at each bin.
Sbin:: A matrix containing surprisal values at each bin.
Pmatfine:: A matrix of probabilities over a fine mesh.
Smatfine:: A matrix of surprisal values over a fine mesh.
DSmatfine:: A matrix of the values of the first derivative of surprisal curves over fine mesh.
D2Smatfine:: A matrix of the values of the second derivative of surprisal curves over fine mesh.

Details

For each question and each examinee a vector of random multinomial integer values is generated using the probability transforms of the surprisal curves and the examinee's score index value.