Tuesday, February 28, 2006

st: RE: count data and test for zero inflated poisson distribution

Stata offers many commands for these distributions and others in the same territory.

Please use -help-, -search- and the manual before sending such queries to the list.

Nick n.j.cox@durham.ac.uk

Rajesh Tharyan > I have a dataset which looks like the one below > > Individual 1 individual 2 > Time count count > 1 0 1 > 2 1 0 > 3 0 0 > 4 0 0 > 5 3 1 > 6 0 0 > 7 1 0 > > Time represents months and count represents the occurance of > an event. I > understand that count might follow a zero inflated poisson > distribution or > a negative binomial distribution. > > Are there any stata command to check if the data fits these > distributions? > (just like we have the shapiro-wilk test for normality.). > > My objective is to see if there is any increase in the counts > between say > period1 (time 1 to 3) and period2 (time 4 to7) for each > individual. And for > all individuals taken together...

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