st: RE: Loops and counter

["Sarah Edgington" <sedging@ucla.edu>]

I think you're looking for something along the lines of :
	gen total=0
	forvalues i=1/14 {
		replace total=total+a`i'*b`i'*365.24
	}

	replace total=total/(z*365.24)

If you find yourself doing repetitive calculations often, you would likely be well-served by carefully reading the -forvalues- and -foreach- manual entries carefully.

-Sarah

-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Thomas Speidel
Sent: Friday, March 22, 2013 10:57 AM
To: statalist@hsphsun2.harvard.edu
Subject: st: Loops and counter

I am trying to shorten the following expression in Stata:

gen total = ((a1 * b1 * 365.24) + (a2 * b2 * 365.24) + ... +  (a14 *
b14 * 365.24)) / (z * 365.24)

Where a1-a14, b1-b14, z are all continuous variables.
Typing the expression in full is time consuming. I seem to recall I should be using a loop with a counter to cycle through every value 1-14. 
However, I am not sure how to do that.

Thanks.

--
Thomas Speidel
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