06-07-2016 12:19 PM
I previously used regression analysis and there is a significant difference. Then I realize my dependent variable is not normally distirbuted, it is very skewed.
So I use proc genmod. Anyother analysises, please give advice.
below is the error message
1523 proc genmod data = have;
1524 model abb= mbb /dist=negbin;
NOTE: Non-integer response values have been detected for the
Negative Binomial distribution.
WARNING: No output destinations active.
NOTE: Algorithm converged.
NOTE: The negative binomial dispersion parameter was estimated
by maximum likelihood.
NOTE: PROCEDURE GENMOD used (Total
06-07-2016 12:52 PM
"dist=negbin" requests maximum likelihood parameter estimation to explain things that can be counted. Counts are integers. What is abb?
06-07-2016 01:04 PM
Advice: Take an Introductory course in Probability. Learn the difference between discrete and continuous distributions.
06-07-2016 01:49 PM
You didn't mention which type of regression you initially performed. Many types do not require the data to be normally distributed but that the errors are normally distributed.