The Nominal Response Model (NRM) item parameters are taken from Wollack's study (1996) and used to generate simulated.data
.
data(ipar)
A data frame with 40 rows and 10 columns.
Slope.A
NRM slope parameter for response alternative A
Slope.B
NRM slope parameter for response alternative B
Slope.C
NRM slope parameter for response alternative C
Slope.D
NRM slope parameter for response alternative D
Slope.E
NRM slope parameter for response alternative E
Intercept.A
NRM intercept parameter for response alternative A
Intercept.B
NRM intercept parameter for response alternative B
Intercept.C
NRM intercept parameter for response alternative C
Intercept.D
NRM intercept parameter for response alternative D
Intercept.E
NRM intercept parameter for response alternative E
Wollack, J.A.(1996). Detection of answer copying using item response theory. Dissertation Abstracts International, 57/05, 2015.
Bock (1972). Estimating item parameters and latent ability when responses are scored in two or more nominal categories. Psychometrika, 37, 29-51 .