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st: Question about sums
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
Thanks for helping me!
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