Date:         Tue, 4 May 1999 12:40:11 +0100
Reply-To:     Peter Crawford <Peter@CRAWFORDSOFTWARE.DEMON.CO.UK>
Sender:       "SAS(r) Discussion" <SAS-L@UGA.CC.UGA.EDU>
From:         Peter Crawford <Peter@CRAWFORDSOFTWARE.DEMON.CO.UK>
Organization: Crawford Software Consultancy Limited
Subject:      Re: Interpolation imputation for missing

Shiansong Li <shiansong@YAHOO.COM> writes
>Hello, all,
>
>How to write SAS to impute missing values by linear interpolation (not
>locf).
>
>Data itpltn;
>obs value;
>1   6
>2   .
>3   .
>4   12
>5   .
>6   11
>
>The output data set should be like this:
>obs value;
>1   6
>2   8
>3   10
>4   12
>5   11.5
>6   11
>
>Thanks in advance.
>
>_________________________________________________________
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before we repeat the solution from last weeks SAS-L, please would you
explain the statistical context you might use these interpolated values?
 
--
Peter Crawford    (_knowledge_ is a poor substitute for *real* experience,
                                               but they make a great team)