topic Re: Non Parametric Confidence Intervals more than 2 groups in New SAS User

Non Parametric Confidence Intervals more than 2 groups

MikeAAC — Fri, 12 Oct 2018 18:40:41 GMT

Hi all ,

I have a population of 3 variables rate1, rate2, group. The variable group has 3 levels (group1, group2, group3) and the distributions of the rates are not normal. How in SAS, can I determine which group has higher means vs another group? I would like for example to build a non parametric confidence intervals between different groups for each rate: CI (group1 - group2), CI (group1 - group3) and CI(group2 - group3). Thanks for the help.

Re: Non Parametric Confidence Intervals more than 2 groups

PGStats — Fri, 12 Oct 2018 19:30:58 GMT

The expression CI(Group1-Group2) can mean many different things.

Have you considered transforming rate1 and rate2 to normality (within groups)? Or finding what distribution the rates may be from? GLIMs (proc genmod, proc glimmix) can be fitted to many distributions and provide you with CIs for group mean differences.

Re: Non Parametric Confidence Intervals more than 2 groups

MikeAAC — Sun, 14 Oct 2018 23:43:05 GMT

Thanks PG