Notice: On April 23, 2014, Statalist moved from an email list to a forum, based at statalist.org.
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: st: programming question for instrument scoring with weights
From
Austin Nichols <[email protected]>
To
[email protected]
Subject
Re: st: programming question for instrument scoring with weights
Date
Thu, 9 Jun 2011 12:06:32 -0400
Stas--
Not well, though:
. egen m=rowtotal(rep78 price), missing
. su m rep78 price
Variable | Obs Mean Std. Dev. Min Max
-------------+--------------------------------------------------------
m | 74 6168.432 2949.481 3294 15909
rep78 | 69 3.405797 .9899323 1 5
price | 74 6165.257 2949.496 3291 15906
On Thu, Jun 9, 2011 at 12:02 PM, Stas Kolenikov <[email protected]> wrote:
> 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 <[email protected]> wrote:
>> Stas; Marguerite <[email protected]>:
>> 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 <[email protected]> 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.
*
* For searches and help try:
* http://www.stata.com/help.cgi?search
* http://www.stata.com/support/statalist/faq
* http://www.ats.ucla.edu/stat/stata/