Pct Certainity & Mc Fadden pseudo R² squared

Question

Simple question: Can we say that the Pct Certainty is the same than the Mc Fadden pseudo R² squared?

In previous posts, I see that Pct Certainity is defined as follewed:
Pct Certainty=(LL final model- LL Chance model)/(-LL of the Chance model)

Mc Fadden pseudo R² squared however is defined as:
 R2McF = 1 – (LL final model / LL Chance model)

Which is in fact simply another way to formulate it. Am I missing something here?

Answer 1

Yes, you can do a bit of algebra to show that they are the same.