[R] How to calculate the "McFadden R-square" for LOGIT model?

[Ben Bolker]

Christofer Bogaso <bogaso.christofer <at> gmail.com> writes:

> 
> Dear all, can somebody please help me how to calculate "McFadden
> R-square" for a LOGIT model?
  
  [snip]

library("sos")
findFn("McFadden")

  brings you to:

http://finzi.psych.upenn.edu/R/library/pscl/html/pR2.html

  i.e. install the sos package; use it to search 
  install the pscl package
  use the pR2() function