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Re: st: Referencing individual elements of (local) macros

From   Sergiy Radyakin <[email protected]>
To   [email protected]
Subject   Re: st: Referencing individual elements of (local) macros
Date   Thu, 2 Dec 2010 16:52:39 -0500

Dear Miros Lav,

I salut your intent to use arrays for that, indeed you can do it with
arrays. Many statalisters
prefer variables lists instead. Given that you want only one var from
each list, just extract it
as a word by its index. See below.

If you are doing any data mining/optimal model search, investigate
further, e.g. see -bestreg-
by Zurab Sajaia:

net from

    Sergiy Radyakin

sysuse auto

local depvars "price weight length"
local controlvars "rep78 foreign mpg"

local n_models : word count `depvars'
assert `n_models'==`:word count `controlvars''  // this ensures that
the two lists are of the same length

forval i=1/`n_models' {
	local this_depvar `: word `i' of `depvars''
	local this_controlvar `:word `i' of `controlvars''
	regress `this_depvar' `this_controlvar'

On Thu, Dec 2, 2010 at 4:03 PM, miros lav
<[email protected]> wrote:
> Dear Statalisters,
> I am wondering whether it is possible to reference the individual
> elements of a (local) macro by a number. For example, if I have the
> local macro x "var1 var2 var3". How would something like reg y `x'[3]
> work.
> Long explanation:
> I would like to estimate a number of models with different dependent
> and independent variables. The control variable varies with the
> dependent variable. I would like to use some kind of loop structure
> (since I want to do a lot of estimations). so, I have defined two
> macros. Lets say that they each have three elements.
> local depvars " depvar1 depvar2 depvar3"
> local controlvars " controlvar1 controlvar2 controlvar3"
> I would like to do something like that
> i=1
> foreach c of local depvar{
> reg `c' `controlvars'[i]
> i++
> }
> Thanks for your help!
> R.
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