Hi @Lidia1,
The definition of "responder" and "non-responder" is study or project-specific and therefore contained in the statistical analysis plan (SAP) of your clinical trial/project, possibly with a reference to the study protocol. These documents are must-reads for the Statistical Programmer. The SAP should also contain more details about statistics to be calculated. Ask the Study Statistician if something is unclear. Once you know what exactly needs to be calculated, the experts here will be able to advise you how to do this with SAS.
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