mirt (version 1.35.1)

vcov-method: Extract parameter variance covariance matrix

Description

Extract parameter variance covariance matrix

Usage

# S4 method for SingleGroupClass
vcov(object)

Arguments

object

an object of class SingleGroupClass, MultipleGroupClass, or MixedClass

References

Chalmers, R., P. (2012). mirt: A Multidimensional Item Response Theory Package for the R Environment. Journal of Statistical Software, 48(6), 1-29. 10.18637/jss.v048.i06

Examples

# NOT RUN {
# }
# NOT RUN {
x <- mirt(Science, 1, SE=TRUE)
vcov(x)

# }