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Re: st: Loop question


From   Cory Smith <corybsmith@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Loop question
Date   Sat, 9 Feb 2013 11:00:54 -0500

I don't think it's the equals sign, it's just the fact that I wrote it
as a string. The max length for strings is one of the infinitely
annoying parts of Stata that they refuse to fix.

Anyway, you're right, if you have a long list it should go
local ends _icw _imp1w _imp2w _imw ...

On Sat, Feb 9, 2013 at 10:51 AM, Nick Cox <njcoxstata@gmail.com> wrote:
> Note also that using equals signs when not needed can bite you:
>
> SJ-8-4  pr0045  . . . . . . . . Stata tip 70: Beware the evaluating equal sign
>         . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  N. J. Cox
>         Q4/08   SJ 8(4):586--587                                 (no commands)
>         tip explaining the pitfall of losing content in a macro
>         because of limits on the length of string expressions
>
> Nick
>
> On Sat, Feb 9, 2013 at 3:35 PM, Cory Smith <corybsmith@gmail.com> wrote:
>
>> It's a stylistic choice. Personally, I think it's cleaner to declare
>> all special lists upfront, though I realize there are aspects of
>> Stata's structure which discourage this.
>
> On Sat, Feb 9, 2013 at 4:34 AM, Nick Cox <njcoxstata@gmail.com> wrote:
>
>>> Could also be
>>>
>>> foreach e in _icw _imp1w _imp2w _mw {
>>>      reg post`e' i.appliance pre`e'
>>> }
>>>
>>> The local macro does no harm, but more direct code will work too.
>
> On Sat, Feb 9, 2013 at 6:01 AM, Cory Smith <corybsmith@gmail.com> wrote:
>
>>>> do something like:
>>>>
>>>> local ends = "_icw _imp1w _imp2w _imw"
>>>>
>>>> foreach e of local ends {
>>>>     reg post`e' i.appliance pre`e'
>>>> }
>
> On Sat, Feb 9, 2013 at 12:54 AM, Nikolaos Pandis <npandis@yahoo.com> wrote:
>
>>>>> I am trying to do the following in Stata 12.1:
>>>>> ************************************************************
>>>>>
>>>>>  foreach myvarpre of varlist pre_icw pre_imp1w pre_ipm2w pre_imw {
>>>>>      foreach myvarpost of varlist post_icw post_ipm1w post_ipm2w post_imw {
>>>>>          reg `myvarpost' i.appliance `myvarpre', noheader
>>>>>      }
>>>>>  }
>>>>> *******************************************************************
>>>>> How can I restrict in the regression and adjust only for the corresponding pre_* variable and not for all the variables in my list?
>>>>>
>>>>> I would like only to get only the following:
>>>>>
>>>>> reg post_icw i.appliance pre_icw
>>>>> reg post_imp1w i.appliance pre_imp1w
>>>>> reg post_imp2w i.appliance pre_imp2w
>>>>> reg post_imw i.appliance pre_imw
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