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Re: st: RE: macro of macros?


From   Maria Ana Vitorino <vitorino@wharton.upenn.edu>
To   <statalist@hsphsun2.harvard.edu>
Subject   Re: st: RE: macro of macros?
Date   Sun, 6 Nov 2011 10:41:00 -0500

ok. so maybe I wasn't clear....

What Tirthankar suggested (which is below) works fine but the problem is that it's not very easy to read what are the different sets used in the estimation, i.e. the first line inTirthankar's suggested code can get very long and hard to read if one has many different specifications with many variables. So, what I was trying to do was to define the different sets in separate lines so that it's easier to read and make changes. What you proposed in the previous response works well but may be prone to errors so I was wondering if there was a way around that.
Is it more clear what I'm looking for now? Any help is appreciated.

Tirthankar's suggestion:

local rhssets ""x1 x2" "x4 x5" "x2 x6""
local counter = 1

foreach x of local rhssets {
	reg y `x'
	predict yhat`counter'
	local counter = `counter' +1
}

Your suggestion:
local index
local set1 "x1 x2"
local index `index' 1
local set2 "x2 x3"
local index `index' 2

foreach i of local index {
	reg y xvars `set`i''
}

Ana

On Nov 6, 2011, at 10:29 AM, Nick Cox wrote:

You can do what Tirthankar showed you just recently. In many ways it's a better method. For reasons that weren't clear to me it seemed that you wanted something different.

You might find these tutorials useful:

SJ-3-2 pr0009 . . . . . . . . . . . . . Speaking Stata: Problems with lists . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . N. J. Cox Q2/03 SJ 3(2):185--202 (no commands)
       discusses ways of working through lists held in macros

SJ-2-2 pr0005 . . . . . . Speaking Stata: How to face lists with fortitude . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . N. J. Cox Q2/02 SJ 2(2):202--222 (no commands)
       demonstrates the usefulness of for, foreach, forvalues, and
       local macros for interactive (non programming) tasks

Nick
n.j.cox@durham.ac.uk

Maria Ana Vitorino

Thanks Nick. This is very helpful.
This requires that every time I add a set I have to include two
additional lines and to make sure that the name of the set is in line
with the index. Using the example again,

If I add another set, say set 4 I need to do:

local set4 "x5 x6"
local index `index' 4

but suppose that what I do (by mistake) is

local set4 "x5 x6"
local index `index' 3

Any chance I can add another set in such a way that these types of
mistakes won't happen?
Thanks!
Ana


On Nov 6, 2011, at 10:07 AM, Nick Cox wrote:

Wildcards are for variable names only. But you don't need any such
device here. There are various ways to approach what you want.
Here's one:

local index
local set1 "x1 x2"
local index `index' 1
local set2 "x2 x3"
local index `index' 2

foreach i of local index {
	reg y xvars `set`i''
}

Nick
n.j.cox@durham.ac.uk

Maria Ana Vitorino

I've only recently started experimenting with macros and I have the
following question: can we have a macro of macros and loop through the
different sub-macros without having to set beforehand  how many sub-
macros there are in the macro? Maybe it's easier to understand what
I'm looking for with an example:

I know that the following can be done:

local set1 "x1 x2"
local set2 "x2 x3"
local sets ""`set1'" "`set2'""  ***

foreach xvars of local sets {
reg y xvars
}

But, instead of having to list all the macros in the line ***, can we
have something like:

local set1 "x1 x2"
local set2 "x2 x3"

local sets ""`set'*""

foreach xvars of local sets {
reg y xvars
}


Ideally I would like to add (or remove) sets as a please so I wouldn't
like to have to keep updating the line *** everytime I do so...


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