simDRM function

simulate data according to Rasch model

With this function data sets according to the dichotomous Rasch model (DRM) are simulated

simDRM(itempar, persons = 500, seed = NULL)

Arguments

• itempar: a vector with item difficulty parameters
• persons: number of persons for the generated data set
• seed: a seed for the random number generated can optionally be set

Returns

• datmat: simulated data set - true_itempar: the fixed item parameters according to the input - true_perspar: the fixed person parameters

Details

Data are generated with category values 0 and 1.

Person parameters are generated by a standard normal distribution.

Examples

#set item parameters
item_p <- c(-1.5,-0.3,0,0.3,1.5)

#number of persons
pn <- 500

#simulate data set
simdatD <- simDRM(item_p, pn)

References

Fischer, G. H. (1974). Einfuehrung in die Theorie psychologischer Tests [Introduction to test theory]. Bern: Huber.

See Also

simMPRM``simCRSM

Author(s)

Christine Hohensinn