[R] likelihood

Ashta sewashm at gmail.com
Mon Mar 8 22:28:52 CET 2010

Hi all,

Does any one know how to write the likelihood function for Poisson distribution
in R when  P(x=0).

 For normal case, it an be written as follows,

  n  *  log(lambda)  -  lambda  *  n  *  mean(dat)


Any help is highly appreciated


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