What happened to mvdisc and mvint_1?

[Elia Emmers]

Hello! My name is Elia and I am somewhat new to IRT and the mirt package. Thanks Phil for all your work! This is a great package!

Question. The Journal of Statistical Software for this package mentions in example 4.2 that one can obtain a "multivariate discrimination" and "multivariate intercept" MVDISC and MVINT_{k} parameter estimates just by using the coef() function. 

However, when I fit my data to a 5-factor graded response (Samejima, 1969) model, they don't show. Are these estimates only defined for binary data? Or only for 2-dimensional models? Or only available for a certain type of estimator?

My sample is more than 5000, it has no missing data and it's 3-category Likert-type response. 

I'm only fitting the function mirt(MY DATA, model=5, method = "MHRM") and no warnings or anything come up. 

Thank-you!

Elia. 

[Phil Chalmers]

Hi Elia,

See the MDISC and MDIFF functions in the package. These summary statistics have since been removed from the coef()/summary() functions to allow for more flexibility. Cheers. 

Phil

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[Elia Emmers]

Thanks Phil! That was super helpful.