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Re: st: Tracking Replacements Made to Variables


From   Nick Cox <njcoxstata@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Tracking Replacements Made to Variables
Date   Tue, 1 Feb 2011 11:02:13 +0000

On a different tack: note that what you did is just linear
interpolation. See -help ipolate-.
What you did presupposes that times are regularly spaced (probably not
an issue in your case) and it will only work to fill in gaps of length
1 (perhaps deliberately). -ipolate- will handle both issues. It still
leaves open the question of whether linear interpolation is the best
way to interpolate. Other interpolation commands include -cipolate-
and -csipolate- (SSC).

Nick

On Mon, Jan 31, 2011 at 9:13 PM, Christopher Lanoue <cal282@cornell.edu> wrote:

> My problem is that I am trying to keep track of changes that I make to
> my data [....] For instance if I have data such as:
>
> yr        var1
> 1961    15
> 1962     .
> 1963    20
> 1964     .
> 1965    30
>
> and I want to take the average of the two data points to fill in the
> missing values.
>
> I run replace var1 = (var1[_n-1]+var1[_n+1])/2 if var1 == . to
> accomplish this task

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