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st: replacing missing cases


From   "Ronnie Babigumira" <ronnie.babigumira@ios.nlh.no>
To   "Statalist" <statalist@hsphsun2.harvard.edu>
Subject   st: replacing missing cases
Date   Tue, 4 Feb 2003 13:35:10 +0100

Hi, brain block here, need some help

I am running regressions on sub-samples (diffrent years) of a data set. I
would like to add the crimerate (lcrmrte) of 1986 to a regression for 1987
so I generate lcrmte86 which is the rate for 1986 however as u can see, its
missing if the year is not 1986 (which makes sense). I would now like to
fill in the missing values with the county value for 1986 (such that lcrmte
= -3.359507 when county == 1 and so forth).

How do I replace the missing cases in lcrmte86 with the county value given.

  lcrmrte   lcrmte86     county       year
-3.221757          .          1         81
-3.261134          .          1         82
-3.496449          .          1         83
 -3.36027          .          1         84
-3.308445          .          1         85
-3.359507  -3.359507          1         86
-3.335309          .          1         87
-4.110956          .          3         81
-3.959896          .          3         82
-4.189807          .          3         83
 -4.29313          .          3         84
 -4.41997          .          3         85
-4.342945  -4.342945          3         86
-4.182966          .          3         87
-4.673753          .          5         81
-4.396296          .          5         82
 -4.35781          .          5         83
-4.280922          .          5         84
-4.384005          .          5         85
-4.251806  -4.251806          5         86
-4.345864          .          5         87
-3.820543          .          7         81
-4.052395          .          7         82
-3.720948          .          7         83
-3.801224          .          7         84
-3.705627          .          7         85
-3.724378  -3.724378          7         86
-3.621101          .          7         87

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