https://communities.sas.com/t5/SAS-Procedures/Operations-calling-values-of-a-variable-in-specific-rows/m-p/9805#M783 Thanks a lot Peter, the LAG() function solved my doubt.<BR /> <BR /> Asier. Tue, 15 Feb 2011 16:20:39 GMT deleted_user 2011-02-15T16:20:39Z https://communities.sas.com/t5/SAS-Procedures/Operations-calling-values-of-a-variable-in-specific-rows/m-p/9803#M781 Hi !<BR /> How could I perform operations with the value of a variable in a specific row ? could be the previous row (n-1.variable), the next one (n+1.variable), the first (first.variable), the last (last.variable) or the value from a variable in a specific row number (rowx.variable).<BR /> <BR /> <BR /> I am trying to perform operations like:<BR /> <BR /> <BR /> if n.variable ne n-1.variable then y=1;<BR /> <BR /> <BR /> Thanks in advance.<BR /> <BR /> Asier Mon, 14 Feb 2011 23:03:00 GMT https://communities.sas.com/t5/SAS-Procedures/Operations-calling-values-of-a-variable-in-specific-rows/m-p/9803#M781 deleted_user 2011-02-14T23:03:00Z https://communities.sas.com/t5/SAS-Procedures/Operations-calling-values-of-a-variable-in-specific-rows/m-p/9804#M782 have you looked at the LAG() function? Mon, 14 Feb 2011 23:11:59 GMT https://communities.sas.com/t5/SAS-Procedures/Operations-calling-values-of-a-variable-in-specific-rows/m-p/9804#M782 Peter_C 2011-02-14T23:11:59Z https://communities.sas.com/t5/SAS-Procedures/Operations-calling-values-of-a-variable-in-specific-rows/m-p/9805#M783 Thanks a lot Peter, the LAG() function solved my doubt.<BR /> <BR /> Asier. Tue, 15 Feb 2011 16:20:39 GMT https://communities.sas.com/t5/SAS-Procedures/Operations-calling-values-of-a-variable-in-specific-rows/m-p/9805#M783 deleted_user 2011-02-15T16:20:39Z