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st: extrapolation using regression

From   kokootchke <>
To   statalist <>
Subject   st: extrapolation using regression
Date   Tue, 19 Aug 2008 16:14:57 -0400

Dear Stata users,

I have a panel with 150 countries and years from 1965 to 1992. I have a variable "k", whose values by country I need to extrapolate to 1997. The problem is that I don't want to use the extrapolation method that Stata uses with the -ipolate- command. What I want is to run a regression of my variable k on a linear time trend by country, and then use the last "k" available for each country and the estimated beta to "forecast" the value of k for 1997.

One problem, though, is that the availability of k differs by country. For some countries, it is available for the entire sample up to 1992; for others, it is available only until 1990 or 1991; for a few of them, the data are only available until 1985, for example.

How can I extrapolate the values up to 1997 using this idea of a linear time trend and taking into account the data point for the last k available for each country?

I am writing a very complicated program with lots of loops, which seems very inefficient and not too intuitive... and I'm sure there's a better way of doing this... any ideas?

In case you want to see what my data looks like, it's something like this:

country         year        k
ARGENTINA   1965       50
ARGENTINA   1966       52
ARGENTINA   1990       78
ARGENTINA   1991       80
ARGENTINA   1992       81
BOLIVIA        1965       16
BOLIVIA        1966       18
BOLIVIA        1990       28
BOLIVIA        1991       .
BOLIVIA        1992       .

Thank you very much in advance!!

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