Hi,

In order to use the mle2-function, one has to define the likelihood function
itself. As we know, the likelihood function is a sum of the logarithm of
probability density functions (pdf).  I have implemented myself the pdfs
that I am using. My problem is, that the pdfs values are negative and I
cann't take the logarithm of them in the log-likelihood function.

So how can one take the logarithm of negative values of the pdfs?

Thanks a lot for your advice!

Zoe

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