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st: RE: create local with specific value of a variable


From   "MacLennan, Graeme" <g.maclennan@abdn.ac.uk>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   st: RE: create local with specific value of a variable
Date   Wed, 20 Feb 2013 15:54:35 +0000

Pablo asked:
Sometimes I need to save in a local a specific value of a variable and I cannot do it because creating a local does not support "if" neither "in" conditions. For instances, let's suppose that I have two
variables: "x" and "y". Variable "x" goes from 1 to 100 and "y" is a random vector. Now, how can I save in a local the value of "y" when "x" is, for example, 50?  In other words, I would like to do something like this:

local y50 = y if x == 50

Something like this perhaps?

*** example start ***
* This assumes that y is constant within categories of x
clear
sysuse auto
local num = 41
summ mpg if mpg == `num'
local mpg`num' = r(mean)
di "`mpg41'"*** example end ***
*** example end ***

HTH, Graeme.


Graeme MacLennan
Senior Statistician
Health Services Research Unit
Health Sciences Building
University of Aberdeen
Foresterhill
Aberdeen AB25 2ZD
Tel: +44 (0)1224 438147
Fax +44 (0)1224 438165
Email: g.maclennan@abdn.ac.uk
Web: www.abdn.ac.uk/hsru


Sometimes I need to save in a local a specific value of a variable and I cannot do it because creating a local does not support "if" neither "in" conditions. For instances, let's suppose that I have two
variables: "x" and "y". Variable "x" goes from 1 to 100 and "y" is a random vector. Now, how can I save in a local the value of "y" when "x" is, for example, 50?  In other words, I would like to do something like this:

local y50 = y if x == 50

I know that is not possible and it is actually a "heresy" in Stata language but it might give you an idea of what I need.

Thank you so much for your help and any idea is more that welcome.

Best


----

Pablo Bonilla

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