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Date:         Fri, 22 May 2009 17:35:29 -0400
Reply-To:     Randy <randistan69@HOTMAIL.COM>
Sender:       "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>
From:         Randy <randistan69@HOTMAIL.COM>
Subject:      Lead Function

Dear All: Is there a lead function in SAS 9.1. I could not find it in Documentation. Perhaps you guys can help me with my question. The data set is as follows:

VarA Time A 11:31 A 11:32 A 11:33 A 11:35 B 11:36 A 11:40 A 11:51 A 11:52 B 11:53 B 11:54 B 11:55 A 11:57

The dataset that I want with the lead time with one condition. Two lags before a B takes the time of the last B in the group. So in the case of the first B the var Lead_time (third row) takes a value of 11:36 (the value of the last B in that group). Similarly, the lead_time value in row 7 takes the value of the last B value (11:55) in the forward group

VarA Time Lead_time A 11:31 11:32 A 11:32 11:33 A 11:33 11:36 A 11:35 11:36 B 11:36 11:40 A 11:40 11:51 A 11:51 11:55 A 11:52 11:53 B 11:53 11:54 B 11:54 11:55 B 11:55 11:57 A 11:57 .

Can you please help.


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