https://communities.sas.com/t5/SAS-Procedures/Standard-Deviations/m-p/50802#M13879 If you mean doing the std dev calculations entirely within a data step, I'm tempted to say its possible, but probably not worth the effort. PROC MEANS is much easier. Wed, 01 Oct 2008 12:09:24 GMT Paige 2008-10-01T12:09:24Z https://communities.sas.com/t5/SAS-Procedures/Standard-Deviations/m-p/50801#M13878 Good Afternoon,<BR /> <BR /> Does anyone know how to calculate 2 standard deviations of a variable within a dataset?<BR /> <BR /> Thank you in advance. Message was edited by: Scottcom4 Wed, 01 Oct 2008 06:19:46 GMT https://communities.sas.com/t5/SAS-Procedures/Standard-Deviations/m-p/50801#M13878 Scottcom4 2008-10-01T06:19:46Z https://communities.sas.com/t5/SAS-Procedures/Standard-Deviations/m-p/50802#M13879 If you mean doing the std dev calculations entirely within a data step, I'm tempted to say its possible, but probably not worth the effort. PROC MEANS is much easier. Wed, 01 Oct 2008 12:09:24 GMT https://communities.sas.com/t5/SAS-Procedures/Standard-Deviations/m-p/50802#M13879 Paige 2008-10-01T12:09:24Z https://communities.sas.com/t5/SAS-Procedures/Standard-Deviations/m-p/50803#M13880 If what you want is to add the 2SD to the dataset, you can do it easily with an aggregate function in PROC SQL.<BR /> <BR /> Doc Fri, 03 Oct 2008 13:06:20 GMT https://communities.sas.com/t5/SAS-Procedures/Standard-Deviations/m-p/50803#M13880 Doc_Duke 2008-10-03T13:06:20Z