Dear Prof.Dr Douglas Bates
I am a R using. I want to estimate the parameters of poisson regression by writing the log like function and use the optim( ) or mle( ) and the compare with estimation of parameters by using glm(). since some of the explanatory variable usually are nominal(age, gender,..), how can do this?. I tried already but the results not same. 
I am looking for your answer.
Thanks Fauzia Taweab


      
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