This function generates the design matrix for an item

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

## Arguments

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

if (FALSE) {
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)
}