designmatrix: Generate design matrix

Description Usage Arguments Value References Examples

View source: R/designmatrix.R

Description

This function generates the design matrix for an item

Usage

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designmatrix(Kj, model = "GDINA", Qj = NULL)

Arguments

Kj

Required except for the MS-DINA model; The number of attributes required for item j

model

the model associated with the design matrix; It can be "GDINA","DINA","DINO", "ACDM" or "MSDINA". The default is "GDINA". Note that models "LLM" and "RRUM" have the same design matrix as the ACDM.

Qj

the Q-matrix for item j; This is required for "MSDINA" model; The number of rows is equal to the number of strategies and the number of columns is equal to the number of attributes.

Value

a design matrix (Mj). See de la Torre (2011) for details.

References

de la Torre, J. (2011). The generalized DINA model framework. Psychometrika, 76, 179-199.

Examples

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## Not run: 
designmatrix(Kj = 2, model = "GDINA")
designmatrix(Kj = 3, model = "DINA")
msQj <- matrix(c(1,0,0,1,
                 1,1,0,0),nrow=2,byrow=TRUE)
designmatrix(model = "MSDINA",Qj = msQj)

## End(Not run)

Wenchao-Ma/GDINA documentation built on May 4, 2018, 3:24 p.m.