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Re: st: the use of loop function in Stata

From   Nick Cox <[email protected]>
To   [email protected]
Subject   Re: st: the use of loop function in Stata
Date   Tue, 13 Mar 2012 19:13:40 +0000

As before I recommend against using the term "loop function". You are
using the -foreach- command. It's not a function (Stata sense).
"Looping with -foreach- " also makes sense.

The reason this doesn't work is that "lnamelist" is not a keyword
recognised by -foreach-: look again at the help.

Till actually recommended something different from what you typed:

foreach lname in lnamelist

but that is also illegal, except in very special circumstances, a loop
with just one literal name "lnamelist". I didn't spot in my earlier
reply that Till's suggestion was illegal (except in very special


On Tue, Mar 13, 2012 at 6:50 PM, Rosie Chen <[email protected]> wrote:
> Thank you, Steve and Till. Below is the revised syntax, but I got an error message of "variable lnamelist not found".  Isn't lp* the list? This is the first time I use the loop function, so any suggestion would be appreciated.
> foreach lname in lnamelist lp*{
> histogram `lname',  by(AI4, col(1))
> graph save histogram`lname', replace
> }
> ----- Original Message -----
> From: Steve Nakoneshny <[email protected]>
> To: "[email protected]" <[email protected]>
> Cc:
> Sent: Tuesday, March 13, 2012 11:28 AM
> Subject: Re: st: the use of loop function in Stata
> You will also need to add the -replace- option to the histogram command.
> On 2012-03-13, at 8:44 AM, Dr. Till Ittermann wrote:
>> Hi,
>> I would loop over lname not var:
>> foreach lname in lnamelist {
>> histogram `lname',  by(AID4, col(1))
>> graph save histogram`lname'
>> }
>> m 13.03.2012 15:36, schrieb Rosie Chen:
>>> Nick, thank you very much for the further advice, which makes the syntax more efficient. Given the loop syntax I have, how to save all the histogram graphs? If I use the code below, the error message says: "file histogram.gph already exists".
>>> foreach var of varlist lp*{
>>>     histogram `var',  by(AID4, col(1))
>>>     graph save histogram
>>> }

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