Hi all, 

I posted this question on Cross Validated a while ago but have never gotten an answer.  

I am trying to see if a discrete distribution will fit a family of zero inflated distributions.   I used fitdist  from fitdistrplus and several gamlss ZIP functions.  Here is a descriptive stat of my distribution;

Min. 1st Qu.  Median    Mean   3rd Qu.    Max. 
  0     3       45      13520    630    469000 

When I used fitdist, I run into this error message, sigma must be between 0 and 1
but estimated sigma of my distribution is 66346.55, which is a way out of the range.  Is there any ways to get around this ?   I really appreciate any pointers.  

Thanks. 

Akii
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