Likelihood Ratio Test

[lazzo]

I turns out that the difference between the constrained and
unconstrained log likelihoods has a chi-square distribution (dergr. of
freedom =restrictions) when it is multiplied by two.

Where the two comes from is something I am not getting. (or -2, the
information I have isn't completely consistent, but I guess that just
depends on which way the difference between the likelihoods is taken).

Where is this 2 (or -2) comming from?


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