| Date: | Wed, 4 Jan 2006 00:14:30 -0800 |
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| Reply-To: | ljmpll@SOHU.COM |
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| Sender: | "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU> |
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| From: | ljmpll@SOHU.COM |
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| Organization: | http://groups.google.com |
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| Subject: | get the former period value |
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| Content-Type: | text/plain; charset="iso-8859-1" |
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In SAS, we can get a lag period value of variant X by the function
lag(X).
Such as:
X Lag period value
20
44 20
23 44
18 23
13 18
12 13
63 12
13 63
11 13
18 11
13 18
But How can we get the former period value of variant X?
(i,e. I want to get the follwing result)
X the former period value
20
20 44
44 23
23 18
18 13
13 12
12 63
63 13
13 11
11 18
18 13
What programs should I write?
Thanks !
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