Generate design matrix — designmatrix • GDINA

This function generates the design matrix for an item

designmatrix(Kj = NULL, model = "GDINA", Qj = NULL, no.bugs = 0)

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","LLM", "RRUM", "MSDINA", "BUGDINO", and "SISM". 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", and "SISM" models; The number of rows is equal to the number of strategies for "MSDINA", and the number of columns is equal to the number of attributes.
no.bugs: the number of bugs (or misconceptions). Note that bugs must be given in the last no.bugs columns.

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)
}