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Re: st: test difference in quintiles


From   sjsamuels@gmail.com
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: test difference in quintiles
Date   Wed, 10 Jun 2009 17:43:13 -0400

"between differences in medians"  should be "between differences in
medians and other percentiles".

On Wed, Jun 10, 2009 at 5:42 PM, <sjsamuels@gmail.com> wrote:
> -cendif-  by Roger Newson, is part of the -somersd- package,
> downloadable from SSC (type "ssc install somersd".  It computes CI's
> for,  and tests, differences between medians.  You will need  large
> sample sizes to test the difference between 5th percentiles with
> reasonable power.  What do you mean by "number of observations in the
> 5th percentile"?  You should not group data prior to the analysis.
>
> -Steve
>
>
>
> On Wed, Jun 10, 2009 at 10:57 AM, Susanne
> Neckermann<sneckermann@iew.uzh.ch> wrote:
>> Hi!
>>
>> I want to test whether the difference in the fifth percentile of two
>> distributions is significant.
>> In principle, this test should be similar to the "median" (thats the name of
>> the command) test already implemented in Stata, but unfortunately I cannot
>> program .ado files and I could not find a user-written procedure.
>> Any idea how to go about this?
>> P.S. the number of observations in the fifth percentile is pretty low
>> (around 6), so one might have to use something with bootstrap or
>> permutations.
>>
>> Thank you so much in advance
>> susanne
>>
>>
>>
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>

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