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# Re: st: RE: Loops and counter

 From To Subject Re: st: RE: Loops and counter Date Fri, 22 Mar 2013 12:38:55 -0600

```Thank you George and Sarah. Both solutions work.

Thomas

On 2013-03-22 12:09, Sarah Edgington wrote:

```
```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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