topic Re: Poisson distribution - Is there a Test for normality on it? in Statistical Procedures

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

jonatan_velarde — Thu, 07 Jan 2016 17:58:28 GMT

Hi there:

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

Thanks

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

lvm — Thu, 07 Jan 2016 18:27:07 GMT

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;

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

Rick_SAS — Thu, 07 Jan 2016 18:28:31 GMT

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.