Helper Function for Conducting Likelihood Ratio Tests
This is a helper function for conducting likelihood ratio tests
and can be generally used for objects for which the
logLik method is defined.
IRT.anova(object, ...)
| object | Object for which the  | 
| ... | A further object to be passed | 
See also IRT.compareModels for model comparisons
of several models.
See also as anova.din.
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