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st: RE: Looping over values of a string variable to create twoways


From   "Martin Weiss" <martin.weiss1@gmx.de>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: Looping over values of a string variable to create twoways
Date   Wed, 30 Sep 2009 20:58:58 +0200

<>

Inn  addition to my earlier post, note that it is not a good idea to name
the -graph- according to the string variable you are conditioning on.
Comment in the fourth string in this example to see that this causes
problems:

**************
clear*

input str10 mystr
"here"
"there"
"everywhere"
//"Allentown-Easton"
end

compress

expand 10

gen x =_n
gen y=rnormal()


levelsof mystr, local(str)

foreach lev of local str{
	tw (line y x if mystr=="`lev'"), /*
	*/ name("`lev'", replace) 
}
**************


HTH
Martin


-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Dorothy Bridges
Sent: Mittwoch, 30. September 2009 19:52
To: statalist@hsphsun2.harvard.edu
Subject: st: Looping over values of a string variable to create twoways

Hi everyone:  I would like to write a foreach loop that will produce a
separate twoway graph for each value of my string variable msa_name.

When I enter:

levels msa_name, local(MSA)
foreach i of local MSA {
#delimit;
twoway (line yvar1 xvar if msa_name==`i' & state1==1, lpattern(dash))
(line yvar2 xvar if msa_name==`i' & state1==1, color(navy) yaxis(2)),
title("`i'",color(black) placement(west) justification(left))
legend(off)
saving(`i', replace);
};

Stata tells me, "end of do file," but does nothing.

In an attempt to isolate the problem, I tried the simpler:

foreach i of local MSA {
twoway line yvar1 xvar if msa_name==`i' & state1==1 & county1==1,
lpattern(dash)
}

which returns, "Allentown not found."  The first value of msa_name is
"Allentown-Easton."

I seached the archives and did find a similar query, but I still could
not solve my problem.

Thanks,
Dorothy
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