Pseudo R2 for Tobit regression

Hey everyone,

I am trying to find a way to calculate the McFadden R2 for a tobit regression, but I cannot find the right package/formula. I now tried it via the following:

fm0 <- update(fmtobit2, . ~ 1)
1 - as.vector(logLik(fmtobit2)/logLik(fm0))

But this gives me a value above 1, does anyone know another method of how I could calculate this value?
Thank you in advance!

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