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


From   Nick Cox <njcoxstata@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Save the percentage of each response category into new variables
Date   Fri, 9 Sep 2011 22:13:55 +0100

-ci, binomial- was updated several years ago to include options that
always produce intervals in [0,1].

Nick

On Fri, Sep 9, 2011 at 10:03 PM, Steven Samuels <sjsamuels@gmail.com> 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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