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Re: st: Save the percentage of each response category into new variables


From   Bryan Sayer <bsayer@chrr.osu.edu>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Save the percentage of each response category into new variables
Date   Fri, 09 Sep 2011 17:12:51 -0400

Just to clarify, this is what I meant by actual percentages:  the use of
some form of a table command, rather than a mean of a 0/1 variable. That is, the software has to know how to distinguish categorical from continuous. Some software may still call this a proportion. Multiplying by 100 is inconsequential to the issue.

Bryan Sayer
Monday to Friday, 8:30 to 5:00
Phone: (614) 442-7369
FAX:  (614) 442-7329
BSayer@chrr.osu.edu


On 9/9/2011 5:03 PM, Steven Samuels wrote:
-svy tab-, with a "ci" option uses the logit transform by default and
for proportions, not for percentages. It can be used for ordinary,
non-survey, data by preceding the -svy tab- command with

svyset _n


Steve


On Sep 9, 2011, at 3:42 PM, Bryan Sayer wrote:

While it is true that the mean of a 0/1 variable is equal to the
proportion, the confidence interval obtained this way may go below
zero or above one, which is generally an undesirable characteristic.

Some software will use a logit transformation to prevent this, but
only when doing confidence intervals of actual percentages.


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