There are several variants of pseudo R^2 that can be computed for a likelihood estimation. They all relate the log likelihood of the estimated model to the log likelihood of the null model.
The ones included here are McFadden's, Adjusted McFadden's, Cox & Snell's, and Nagelkerke, Cragg, and Uhler's.
returned value from
A matrix is returned, with one row for each iteration containing the various pseudo R^2s.
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