Displaying 3 results from an estimated 3 matches for "fit2pl".
2011 Nov 20
2
ltm: Simplified approach to bootstrapping 2PL-Models?
Dear R-List,
to assess the model fit for 2PL-models, I tried to mimic the
bootstrap-approach chosen in the GoF.rasch()-function. Not being a
statistician, I was wondering whether the following simplification
(omit the "chi-squared-expressed model fit-step") would be appropriate:
GoF.ltm <- function(object, B = 50, ...){
liFits <- list()
for(i in 1:B){
rndDat <-
2008 Mar 05
1
degrees of freedom extraction
Hello,
II used the logLik() function to get the log-likelihood estimate of an
object. The function also prints the degrees of freedom. How can I extract
the degrees of freedom and assign it to a variable.
Below is the output:
> logLik(fit2pl)
'log Lik.' -4842.912 (df=36)
Thanks,
Davood Tofighi
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2008 Mar 10
1
ltm package question
Hello All,
I was wondering how I can get the overall Pearson chi^2 test of model fit
with its df and p value in the LTM package for the 2PL models.
Thanks,
--
Davood Tofighi
Department of Psychology
Arizona State University
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