personfit calculates the Zh values from Drasgow,
Levine and Williams (1985) for unidimensional and
multidimensional models. For Rasch models infit and
outfit statistics are also produced. The returned object
is a data.frame consisting either of the tabulated
data or full data with the statistics appended to the
rightmost columns.
Usage
personfit(x, method = "EAP", ...)
Arguments
x
a computed model object of class
ExploratoryClass, ConfirmatoryClass, or
MultipleGroupClass
method
type of factor score estimation method. See
fscores for more detail
...
additional arguments to be passed to
fscores()
References
Drasgow, F., Levine, M. V., & Williams, E. A. (1985).
Appropriateness measurement with polychotomous item
response models and standardized indices. Journal
of Mathematical and Statistical Psychology, 38, 67-86.
Reise, S. P. (1990). A comparison of item- and person-fit
methods of assessing model-data fit in IRT. Applied
Psychological Measurement, 14, 127-137.
#make some dataset.seed(1234)
a <- matrix(rlnorm(20),ncol=1)
d <- matrix(rnorm(20),ncol=1)
items <- rep('dich', 20)
data <- simdata(a,d, 2000, items)
x <- mirt(data, 1)
fit <- personfit(x)
head(fit)