https://communities.sas.com/t5/SAS-Health-and-Life-Sciences/Re-Retain/m-p/6229#M606 Hi,<BR /> <BR /> Can someone please explain when we need to initialize a retain variable to missing or zero?<BR /> <BR /> Thanks<BR /> <BR /> Cathy Wed, 09 Jan 2008 14:31:06 GMT deleted_user 2008-01-09T14:31:06Z https://communities.sas.com/t5/SAS-Health-and-Life-Sciences/Re-Retain/m-p/6229#M606 Hi,<BR /> <BR /> Can someone please explain when we need to initialize a retain variable to missing or zero?<BR /> <BR /> Thanks<BR /> <BR /> Cathy Wed, 09 Jan 2008 14:31:06 GMT https://communities.sas.com/t5/SAS-Health-and-Life-Sciences/Re-Retain/m-p/6229#M606 deleted_user 2008-01-09T14:31:06Z https://communities.sas.com/t5/SAS-Health-and-Life-Sciences/Re-Retain/m-p/6230#M607 When You use by group possessing and u want to do some calculation on every by group in that case u need to initialize the first.variable value 0 so that it will do the calculation for each by group separately<BR /> thanks Mon, 21 Jan 2008 09:12:58 GMT https://communities.sas.com/t5/SAS-Health-and-Life-Sciences/Re-Retain/m-p/6230#M607 deleted_user 2008-01-21T09:12:58Z