https://communities.sas.com/t5/SAS-Procedures/Subratrion-the-obseravtions-in-one-variable/m-p/46392#M12363 Hi<BR /> i have a data set<BR /> <BR /> data x;<BR /> input sal;<BR /> cards<BR /> 10<BR /> 9<BR /> 8<BR /> 7<BR /> 6<BR /> run;<BR /> i want the output like this id should substract form the first obs-second obs<BR /> <BR /> the output shud be like this<BR /> <BR /> sal;<BR /> 10<BR /> 1<BR /> 1<BR /> 1<BR /> run; Tue, 16 Sep 2008 07:48:17 GMT R_Win 2008-09-16T07:48:17Z https://communities.sas.com/t5/SAS-Procedures/Subratrion-the-obseravtions-in-one-variable/m-p/46392#M12363 Hi<BR /> i have a data set<BR /> <BR /> data x;<BR /> input sal;<BR /> cards<BR /> 10<BR /> 9<BR /> 8<BR /> 7<BR /> 6<BR /> run;<BR /> i want the output like this id should substract form the first obs-second obs<BR /> <BR /> the output shud be like this<BR /> <BR /> sal;<BR /> 10<BR /> 1<BR /> 1<BR /> 1<BR /> run; Tue, 16 Sep 2008 07:48:17 GMT https://communities.sas.com/t5/SAS-Procedures/Subratrion-the-obseravtions-in-one-variable/m-p/46392#M12363 R_Win 2008-09-16T07:48:17Z https://communities.sas.com/t5/SAS-Procedures/Subratrion-the-obseravtions-in-one-variable/m-p/46393#M12364 You could use the lag() function or the retain statement to make calculations between different observations.<BR /> <BR /> /Linus Tue, 16 Sep 2008 08:05:41 GMT https://communities.sas.com/t5/SAS-Procedures/Subratrion-the-obseravtions-in-one-variable/m-p/46393#M12364 LinusH 2008-09-16T08:05:41Z