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Re: st: Output from SKTEST


From   Nick Cox <njcoxstata@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Output from SKTEST
Date   Sun, 1 Apr 2012 08:14:58 +0100

I agree with David's advice. It leads to an easy way to work this out yourself.

sysuse auto

foreach v of var price-foreign {
    qnorm `v'
    more
    sktest `v'
}

Nick

On Sat, Mar 31, 2012 at 10:03 PM, David Hoaglin <dchoaglin@gmail.com> wrote:

> Before you use tests based on sample skewness and kurtosis, it would
> be a good idea to look at a normal probability plot for each of the
> variables.  A histogram may also be useful, but it is not sufficient,
> because it will not show you enough about the tails.  You should look
> for outliers, as well as evidence of multimodality.
>
> David Hoaglin
>
> On Sat, Mar 31, 2012 at 4:33 PM, Sandy Y.  Zhu <sandy.zhu@yale.edu> wrote:
>> Hi everyone:
>>
>> I'm having some trouble interpreting the output of Skewness/Kurtosis
>> test, can you tell me if the variables that I tested, rsize and
>> avg_cpi,  are normally distributed?
>

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