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st: Question about sums

From   Rodrigo Brice�o <[email protected]>
To   "Statalist" <[email protected]>
Subject   st: Question about sums
Date   Fri, 5 Mar 2004 13:35:56 -0600

Dear friends of the list. I want to know how to deal with missings when I
need to make a sum. Suppose that I have the following variables:

v1   v2  v3  v4
200  .   30   .
.    350  .   100
280  100  30  .

In my original database each of those variables represents a source of
income and the values are the quantities reported in the survey. I want to
generate a new variable that sums all the reported values, but when I do
this directly I get only missings. I guess that is caused by the sum of
missing data, but I don't know a procedure to sum only values reported and
not missings.

Thanks for helping me!


Rodrigo Brice�o
Sanigest Internacional
Telf. Oficina:     (506) 280-5457
Fax:                     (506) 234-1486
Celular:              (506) 357-4535

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