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Re: st: compounding interest
From
David Kantor <[email protected]>
To
[email protected]
Subject
Re: st: compounding interest
Date
Fri, 23 Jul 2010 14:50:49 -0400
At 02:37 PM 7/23/2010, Jurgen Sidgman wrote:
Does any one know how to multiply two or more values located in the
same column but in different rows?
For example, in the first column I have the following information:
Row 1: 2
Row 2: 3
Row 3: 4
Row 4: 2
What I want to do is to calculate:
Row 1 x Row 2 = 6
Previous result x Row 3 = 24
Previous result x Row 4 = 48
Assuming the values are in a variable named x, ...
gen y = x if _n==1
replace y = y * x[_n-1] if n>1
This can also be done under a -by- construct.
HTH
--David
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