Re: st: definition of pseudo R^2 for dprobit or probit

[Richard Williams <Richard.A.Williams.5@nd.edu>]

At 08:04 PM 10/27/2003 -0600, Scott Merryman wrote:

> [R] maximize, Methods and Formulas section
>
> Pseudo R2 = 1 - L1/L0, where L1 is the log likelihood of the full model and L0
> is the log likelihood of the constant-only model.
That is one of a couple of equivalent formulas but probably the simplest to 
write in an email message!  Certainly clearer than what I wrote earlier.

As a sidelight, this is one of many statistics that claims the name of 
"Pseudo R2".   It would be nice if Stata explicitly labeled it as 
McFadden's R2, and perhaps reported a couple of the other alternatives in 
case anybody wants them.

Of the various alternatives, McFadden's R2 seems to have emerged as the 
favorite and best.  Anybody strongly disagree and think something else is 
better?


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