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# Re: st: compounding interest

 From David Kantor To statalist@hsphsun2.harvard.edu 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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