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# RE: st: programming question for instrument scoring with weights

 From "Lucea, Marguerite" To "statalist@hsphsun2.harvard.edu" Subject RE: st: programming question for instrument scoring with weights Date Thu, 9 Jun 2011 12:04:39 -0400

```Thank you! This worked.

-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Stas Kolenikov
Sent: Thursday, June 09, 2011 12:02 PM
To: statalist@hsphsun2.harvard.edu
Subject: Re: st: programming question for instrument scoring with weights

Oops. Thanks, Austin! There's -missing- option of -egen = rowtotal()-
controlling for the missing value issue, too.

On Thu, Jun 9, 2011 at 10:48 AM, Austin Nichols <austinnichols@gmail.com> wrote:
> Stas; Marguerite <mbaty1@son.jhmi.edu>:
> I think the -egen- "function" below is meant to be rowtotal(), not
> total().  But beware of missing values counting as zeros in such a
> formulation.
>
> On Thu, Jun 9, 2011 at 10:52 AM, Stas Kolenikov <skolenik@gmail.com> wrote:
> ...
>> I am assuming that your items are coded 1 for yes, 0 for no. Or you
>> can do this sequentially:
>>
>> egen int total_score = total( item1 item2 [fill in the dots] item19 )
>> replace total_score = total_score + 4 if item2 == 1
>> ...
>> replace total_score = total_score - 3 if item3a == 1
>>
>> All of these ways are cumbersome, and the more lines of code you have,
>> the more likely it is you will have an error somewhere. The choice
>> between different ways of coding your problem is a matter of
>> aesthetics, and how readable the code will be to you and other users
>> of it.
> ...
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--
Stas Kolenikov, also found at http://stas.kolenikov.name
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```