search for: suddelnly

...) to minimise the loglikelihood function for fitting data to negative binomial distribution. But there initial value of log-likelihood and iteration 10 value are reasonable. for example: initial value 1451657.994524 iter 10 value 47297.534905 iter 20 value -623478636.8236478 Then the iter 20 vlaue suddelnly changes to a negative value and in the end the error mesage is "non finite finite different [13]" Has any one have this experience of what the wrong is? Thanks! Xin My function is: function (parameters,y,x1,x3) { alpha<-parameters[1:10]; beta<-parameters[11]; g<-pa...