[R] R^2 analogue in polr() and prerequisites for polr()

[Christoph Lehmann]

Hi

(1)In polr(), is there any way to calculate a pseudo analogue to the
R^2. Just for use as a purely descriptive statistic of the goodness of
fit?

(2) And: what are the assumptions which must be fulfilled, so that the
results of polr() (t-values, etc.) are valid? How can I test these
prerequisites most easily: I have a three-level (ordered factor)
response and four metric variables.

many thanks

Christoph

-- 
Christoph Lehmann <christoph.lehmann at gmx.ch>