Hi, all
I have a problem about the log maximum likelihood.
I want to estimate several parameters using log maximum likelihood method (mle2() in package "bbmle" ), and the likelihood fucton was based on poisson distribution.
When finished, there were some warnings said that:
 >In dpois(x, lambda, log) : NaNs produced
Will this situation influence my result of parameters estimating or not? If my parameters estimated have been influenced, how can I improve my R code or data to achieve a exact estimating?
Thanks for you attention and best wishes for all of you!  
Guojun Lin
South China Botanical Garden, Chinese Academy of Science, China
Department of Renewable Resources, University of Alberta, Canada
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