# Re: st: loop question

 From Sergiy Radyakin <[email protected]> To [email protected] Subject Re: st: loop question Date Mon, 2 Nov 2009 14:49:25 -0500

```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 <[email protected]> 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
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```