[Gretl-users] About McFadden R-squared

Dear all, I could find the formula explaining how to calculate McFadden R-squared in the gretl user's guide. I tried to replicate it in Probit model but I fail to get the same value. Is anything wrong with my calculation as follows. Thanks Yi-Nung Yang <script> nulldata 10 set seed 89675430 series u=normal() series y=(u>0) series x = uniform() probit y const x scalar lnL=$lnl probit y const scalar lnL0=$lnl # McFadden R-squared as in Greene's Econometric Analysis scalar McR2= 1-lnL/lnL0 </script>