Bi-factor MIRT: model fit statistcs and parameter estimates output

[yingyi....@gmail.com]

Hi all,

When using the “bfactor” function with the following codes, it runs perfectly, however, without columns output “guess” & “mvdisc” & “mvint_1”. I saw these 3 columns outputted in the paper titled as “mirt: A Multidimensional Item Response Theory Package for the R Environment (2012)”. We have 18 items, composing one General dimension, and item8-15 for sub-factor 1, item 16-18 for sub-factor 2. In addition to the “guess” & “mvdisc” & “mvint_1” columns, I also wonder if bfactor() function could output model fit statistics (e.g. RMSEA, CFI)? I did not find such information in the R documentation, I am not so sure if I missed anything.

specific <- c(NA,NA,NA,NA,NA,NA,NA,1,1,1,1,1,1,1,1,2,2,2)
b_mod <- bfactor(data, specific)
coef(b_mod)
summary(b_mod)

Thanks,

Yingyi

[Phil Chalmers]

See MDIFF() and MDISC(). Also, the old RMSEA and CFI output have been deprecated because they were too unstable. You want the M2() function. 

Phil

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