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Re: st: Appropriate use of -forvalues- and -foreach- commands


From   "Kristin J. Kleinjans" <[email protected]>
To   <[email protected]>
Subject   Re: st: Appropriate use of -forvalues- and -foreach- commands
Date   Thu, 19 Apr 2007 18:28:08 +0200 (CEST)

Hi Sebastian and Carter,
wouldn't
by bld: egen mean_x=mean(x)
do the same thing, or am I confused here?
Of course, it would include the x for the worker in question in the mean,
which might not be what you want or need.

Regards,
Kristin J. Kleinjans



> Carter,
>
> I do not think you need the -forvalues- or -foreach- command here. What
> you are asking for can also be achieved with the following:
>
> //inputting example data
> clear
> input id bld bld1 bld2 bld3 bld4 bld5 x1 x2 x3 x4 x5
>    1  10 11 10 10 10 11 6 7 2 4 2
>    2  11 11 11 13 13 11 6 8 4 7 0
>    3  12 12 12 12 12 12 6 1 2 4 3
>    4  13 13 10 10 10 14 10 5 10 9 5
>    5  14 15 14 . . . 3 10 5 1 3
>    6  15 15 . . . . 2 6 5 2 7
> end
>
> // rename bld to bld_id
> ren bld bld_id
>
> // reshape the data to long structure
> reshape long bld x, i(id) j(cow_no 1 2 3 4 5)
>
> // determine the mean value of x for those coworkers within the same //
> building - will not record anything if bld_id id missing (.)
> bys id: egen bld_mean_x = mean(x) if bld == bld_id & bld_id != .
>
> // make sure that values is entered in any observation belonging to //
> an id
> bys id (bld_mean_x): replace bld_mean_x = bld_mean_x[1]
>
> // reshape the data back to wide
> reshape wide bld x, i(id) j(cow_no)
>
> The mean value for x for co-workers from the same building can now be
> found in the variable bld_mean_x.
>
> Regards
> Sebastian
>
>
> On 4/19/07, Carter Rees <[email protected]> wrote:
>> Statalist,
>>
>> I have the variables id (person id), bld (person's building code),
>> bld1-bld5 (building codes for 5 nominated co-workers).  I also have
>> various co-worker characteristics in my file.  For illustration, let
>> x1-x5 be one of the characteristics listed for each co-worker.  The
>> data are constructed as:
>>
>> id      bld     bld1    bld2    bld3    bld4    bld5    x1      x2
>>  x3 x4      x5
>> 1       10      11      10      10      10      11      6       7
>>  2 4       2
>> 2       11      11      11      13      13      11      6       8
>>  4 7       0
>> 3       12      12      12      12      12      12      6       1
>>  2 4       3
>> 4       13      13      10      10      10      14      10      5
>>  10 9       5
>> 5       14      15      14                              3       10
>>  5 1       3
>> 6       15      15                                      2       6
>>  5 2       7
>>
>> For each person id, I would like to construct a variable that is the
>> mean value of only those co-workers who are in the same building.  For
>> example, the first case would only include co-workers in building 10
>> which would result in an average of (7+2+4)/3 = 4.33.  -forvalues-
>> and/or -foreach- seems appropriate here but I can't seem to get it
>> quite right.
>>
>> Many thanks,
>>
>> Carter
>>
>> *
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>>
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