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 Statistics,
| Department of Economics,
| University of Modena and Reggio Emilia,
| Via Berengario 51,
| 41100 Modena, Italy
|
| tel: +39 059 205 6727
| fax: +39 059 205 6947
| mail: [EMAIL PROTECTED]
+-
2008/7/23 Zornitsa Luleva [EMAIL PROTECTED]:
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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