[R] mle2(): logarithm of negative pdfs

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

Re: [R] mle2(): logarithm of negative pdfs

this is an off-topic, of course! by definition, pdf MUST BE POSITIVE and log function is defined ONLY for positive values. check your pdf code and find out the errors. regards Patrizio Frederic +- | Patrizio Frederic | Research associate in