# Re: st: loop question

 From Sandu Cojocaru To statalist@hsphsun2.harvard.edu Subject Re: st: loop question Date Mon, 2 Nov 2009 15:54:49 -0400

```Sergiy,

Within each group, i'm trying to calculate for each member i the sum
of differences between Cj and Ci for all Cj that are strictly greater
than Ci.

hope this clarifies my question.

cheers,
sandu

On Mon, Nov 2, 2009 at 3:49 PM, Sergiy Radyakin <serjradyakin@gmail.com> wrote:
> Hi, Sandu
> Can you explain how member_id is relevant here?
> Can you explain line 4? (group=2,member=1)
> Do you mean Cj>Ci or Cj!=Ci?
> Best, Sergiy
>
> On Mon, Nov 2, 2009 at 2:34 PM, Sandu Cojocaru <scojocaru@gmail.com> wrote:
>> Dear All:
>>
>> I'm having trouble generating a variable that for each member i equals
>> sum(Cj-Ci) over all Cj>Ci where i and j are members of the same group.
>> Here's an example of the data setup - I'm trying to calculate
>> `outcome_var'.
>> For row 1 outcome_var=0, for row 3 = (200-100)+(300-100) = 300...and so on...
>>
>> group_id       member_id       C           outcome_var
>> 1                  1                     300        0
>> 1                  2                     200        100
>> 1                  3                     100        300
>> 2                  1                     150        50
>> 2                  2                     200        0
>> 2                  3                     100        150
>> 2                  4                     50          300
>> 3                  1 and so on...
>>
>> Any help would be greatly appreciated!
>> sandu
>> *
>> *   For searches and help try:
>> *   http://www.stata.com/help.cgi?search
>> *   http://www.stata.com/support/statalist/faq
>> *   http://www.ats.ucla.edu/stat/stata/
>>
>
> *
> *   For searches and help try:
> *   http://www.stata.com/help.cgi?search
> *   http://www.stata.com/support/statalist/faq
> *   http://www.ats.ucla.edu/stat/stata/
>

*
*   For searches and help try:
*   http://www.stata.com/help.cgi?search
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/
```