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st: Re: multiple response to binary


From   "patrick cooper" <p.cooper@malatest.com>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: Re: multiple response to binary
Date   Fri, 12 Jul 2002 10:58:42 -0600

hi lee
for this, if i understand the situation correctly, could concatinate the
fields into one long one. then sort then do a freq. or continate the fields
(called ALL) and then generate a new field if ALL==1 and so on.

patrick
----- Original Message -----
From: "Lee Sieswerda" <Lee.Sieswerda@tbdhu.com>
To: "Statalist (E-mail)" <statalist@hsphsun2.harvard.edu>
Sent: Friday, July 12, 2002 10:34 AM
Subject: st: multiple response to binary


> Hello all:
> I have a data management problem (WinNT4, Stata v7).
>
> I have data from a questionnaire where some of the questions allow the
> respondent to choose multiple responses. Lets say there 7 possible
responses
> and they could choose any number of them. I would code this as a set of 7
> binary variables. Unfortunately, the way it was coded was not so
> straightforward. It was coded across 7 variables, but the responses were
> simply entered in the order in which they were given by the respondent. So
> the data look like this:
>
> f4m1      f4m2      f4m3      f4m4      f4m5      f4m6      f4m7
>     1         7         4         .         .         .         .
>     1         .         .         .         .         .         .
>     1         .         .         .         .         .         .
>     1         .         .         .         .         .         .
>     7         3         .         .         .         .         .
>     1         .         .         .         .         .         .
>     1         2         3         4         .         .         .
>     1         2         3         4         6         .         .
>     1         2         7         .         .         .         .
>     1         .         .         .         .         .         .
>
> As you can see, you cannot simply tabulate the number of people who
> responded 1, 2 , 3 etc because the responses are scattered over the 7
> variables in a different order for every person. The folks who provided me
> with this data use SPSS and they get around this problem by using
"multiple
> responses sets". In SPSS, you can define a set of variables as a multiple
> response set (in this case, seven variables) and then ask for tables of
> frequencies and crosstabs generated from across the 7 variables. It works,
> but I'd much rather use Stata than SPSS. Also, the SPSS solution is
limited
> to simple tables and doesn't permit you to get chi-square or other
> statistics.
>
> Now, in Stata I know I can generate dummy variables from this mess like
> this:
> gen dum1 = 0
> replace dum1 = 1 if f4m1==1 | f4m2==1 | f4m3==1 etc.
> replace dum1 = . if f4m1==. & f4m2==. & f4m3==. etc.
> gen dum2 = 0
> etc.
>
> However, this is tedious in the extreme and there are many of these
multiple
> response questions in the dataset. I could automate the procedure somewhat
> using -foreach-, but its still more brute force than elegance. Someone
told
> me about a SAS solution to this problem using an array procedure. Does
> anyone have a nice elegant Stata solution to this problem?
>
> Thanks,
>
> Lee
>
> Lee Sieswerda, Epidemiologist
> Thunder Bay District Health Unit
> 999 Balmoral Street
> Thunder Bay, Ontario
> Canada  P7B 6E7
> Tel: +1 (807) 625-5957
> Fax: +1 (807) 623-2369
> Lee.Sieswerda@tbdhu.com
> www.tbdhu.com
>
> *
> *   For searches and help try:
> *   http://www.stata.com/support/faqs/res/findit.html
> *   http://www.stata.com/support/statalist/faq
> *   http://www.ats.ucla.edu/stat/stata/
>
>


*
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