Date:         Wed, 4 Jan 2006 03:22:37 -0500
Reply-To:     "SASsy :-)" <sas__l@HOTMAIL.COM>
Sender:       "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>
From:         "SASsy :-)" <sas__l@HOTMAIL.COM>
Subject:      Re: get the former period value

On Wed, 4 Jan 2006 00:14:30 -0800, ljmpll@SOHU.COM wrote:

>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 !

It is exactly the same, the only thing you need to do is
rename the two columns! ;-)


S