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Re: st: significance of mean and median


From   Maarten buis <maartenbuis@yahoo.co.uk>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: significance of mean and median
Date   Sun, 30 Nov 2008 16:08:33 +0000 (GMT)

--- "Lachenbruch, Peter" wrote:
>>> In general, I've found that bad skewness/asymmetry messes up
>>> significance tests more than heavy tails.  I know I read this
>>> somewhere long ago, and it seems to work pretty well.

--- Maarten Buis wrote:
>> Interesting, I tried this using a simulation where I use a t-test
>> on a chi-square distribution with 3 degrees of freedom, which is
>> quite skewed, but the t-test seems to perform just fine

--- Steven Samuels <sjhsamuels@earthlink.net> wrote:
> The two-sided significance level is OK, but the one-sided levels are
> not.

Ah, that makes sense.
Thanks,
Maarten

-----------------------------------------
Maarten L. Buis
Department of Social Research Methodology
Vrije Universiteit Amsterdam
Boelelaan 1081
1081 HV Amsterdam
The Netherlands

visiting address:
Buitenveldertselaan 3 (Metropolitan), room N515

+31 20 5986715

http://home.fsw.vu.nl/m.buis/
-----------------------------------------


      
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