Description of Bock 1997 data
A 3-item tabulated data set extracted from Table 3 in Chapter Two.
Phil Chalmers rphilip.chalmers@gmail.com
Bock, R. D. (1997). The Nominal Categories Model. In van der Linden, W. J. & Hambleton, R. K. Handbook of modern item response theory. New York: Springer.
Chalmers, R., P. (2012). mirt: A Multidimensional Item Response Theory Package for the R Environment. Journal of Statistical Software, 48(6), 1-29. doi: 10.18637/jss.v048.i06
## Not run:
dat <- expand.table(Bock1997)
head(dat)
mod <- mirt(dat, 1, 'nominal')
#reproduce table 3 in Bock (1997)
fs <- round(fscores(mod, verbose = FALSE, full.scores = FALSE)[,c('F1','SE_F1')],2)
fttd <- residuals(mod, type = 'exp')
table <- data.frame(fttd[,-ncol(fttd)], fs)
table
mod <- mirt(dat, 1, 'nominal')
coef(mod)
## End(Not run)Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.