[R] Distribution fitting problem

[Bernardo Rangel Tura]

At 10:32 2/11/2005, you wrote:

>I am using the MASS library function
>
>fitdistr(x, dpois, list(lambda=2))
>
>but I get
>
>Error in optim(start, mylogfn, x = x, hessian = TRUE, ...) :
>         Function cannot be evaluated at initial parameters
>In addition: There were 50 or more warnings (use warnings() to see the first
>50)
>
>and all the first 50 warnings say
>
>1:  non-integer x = 1.452222
>etc
>
>Can anyone tell me what I am doing wrong. p.s. the data was read in from
>a .csv file that I wrote using octave

Mark,

Try fitdistr(x, "Poisson")

I think this is enough for fit Poisson distribuition for your data


Bernardo Rangel Tura, MD, MSc
National Institute of Cardiology Laranjeiras
Rio de Janeiro Brazil 


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