Notice: On March 31, it was announced that Statalist is moving from an email list to a forum. The old list will shut down on April 23, and its replacement, statalist.org is already up and running.

st: RE: Loops and counter

 From "Sarah Edgington" To Subject st: RE: Loops and counter Date Fri, 22 Mar 2013 11:09:08 -0700

```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
*
*   For searches and help try:
*   http://www.stata.com/help.cgi?search
*   http://www.stata.com/support/faqs/resources/statalist-faq/
*   http://www.ats.ucla.edu/stat/stata/

*
*   For searches and help try:
*   http://www.stata.com/help.cgi?search
*   http://www.stata.com/support/faqs/resources/statalist-faq/
*   http://www.ats.ucla.edu/stat/stata/
```