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Re: st: Filling missing values. with averages


From   SR Millis <srmillis@yahoo.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Filling missing values. with averages
Date   Wed, 14 May 2003 08:14:08 -0700 (PDT)

WHY would you want to do this? Filling in the missing
values with means will artificially reduce the
variance and produce biased parameter estimates.

SR Millis


--- Moon Joong <mj_52@hotmail.com> wrote:
> Dear Stata Lovers,
>
> I'm trying to find a smart way to fill missing
> values with averages between
> nearest values. The data looks like the following:
>
> id   year   rates
> 1   1960  .35
> 1   1961   missing
> 1   1962  .45
> 1   1963  .47
> 1   1964   missing
> 1   1965  .46
> 2   1945  .2
> 2   1946   missing
> 2   1947  .35
> 2   1948   missing
> 3   1949   missing
> 3   1950   .56
> .....
>
> What I want to do is, take the example of id 1 of
> year 1961 (which is
> missing), to fill the average value between .35 and
> .45 (that is
> (.35+.45)/2) into the missinge observation of year
> 1961. Since I have a lot
> of observations to fill in, using brute force by
> hands takes forever and
> would be inaccurate. I think it's very
> straightfoward, which I don't know
> since I'm a beginner.
>
> Thanks in advance.
>
> MoonJoong
>
>
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