Poisson distribution - Is there a Test for normality on it?

[jonatan_velarde]

Hi there:

I am looking for any test to evaluate the normality for a data set in Possion..

Thanks

[lvm]

I don't understand the question. If the data are Poisson, then why test for normality? Maybe you are wondering if you counts are large enough that the Poisson is adequately approximated by a normal distribution? If so, then use PROC UNIVARIATE and look a the output for tests for normality.

proc univariate data=... normal;

var y;

run;

[Rick_SAS · Accepted solution]

Do you mean "Is there a test to determine whether data are Poisson distributed?"  (You can't check for "normality" unless you think the data are normally distributed.)

If so, the answer is yes. You can fit a Poisson distribution to the data and examine the goodness of fit statistics.