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st: Sum of products by sub-groups in mata.
From
Amadou DIALLO <[email protected]>
To
statalist <[email protected]>
Subject
st: Sum of products by sub-groups in mata.
Date
Mon, 20 Jan 2014 17:47:35 +0100
Hi,
I want to compute in mata total by subgroup (the equivalent of stata's
bys group: egen total = total(expense) ).How to do that?
Also, is it possible to use "if" condition with mata? SOmething like:
mata:
sum = 0
for (i=1; i<= maxcountry; i++) {
sum = sum + sum(expense) if country == i
}
sum
end
--
Amadou B. DIALLO, PhD.
Senior Economist, AfDB.
[email protected]
+21671101789
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