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when outcome variable is not normally distributed, what kind of regression analysis

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Super Contributor
Posts: 336

when outcome variable is not normally distributed, what kind of regression analysis

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;

1525 run;

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

Respected Advisor
Posts: 4,651

Re: when outcome variable is not normally distributed, what kind of regression analysis

"dist=negbin" requests maximum likelihood parameter estimation to explain things that can be counted. Counts are integers. What is abb?

PG
Super Contributor
Posts: 336

Re: when outcome variable is not normally distributed, what kind of regression analysis

abb is my dependent variable, mbb is my independent variable

Respected Advisor
Posts: 4,651

Re: when outcome variable is not normally distributed, what kind of regression analysis

Advice: Take an Introductory course in Probability. Learn the difference between discrete and continuous distributions. 

PG
Super User
Posts: 10,516

Re: when outcome variable is not normally distributed, what kind of regression analysis

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.

Super Contributor
Posts: 336

Re: when outcome variable is not normally distributed, what kind of regression analysis

it is linear regression

 

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