I am researching a software reliability model that has many parameters that need to be estimated. I want to use a maximum likelihood estimator (MLE) to estimate those parameters, but my model is too complicated to derive the log-likelihood function (namely LL in the following picture) from the likelihood function (namely L in the following picture).
When I try to execute
Log[L] in Mathematica, I don't get the expected answer (LL). So my question is, how can I get expected answer after taking the log of the equation? Or can Mathematica not do this operation?