Shapiro-Wilk test

[Michael Stobernack-3]

Dear all,

in SPSS 14 there is a possibility to run the shapiro-wilk test for normality.
I tried to find a technical description of the formulas at
h t t
p
://support.spss.com/Tech/Products/SPSS/Documentation/Statistics/algorithms/index.html
But I couldn't find it.
I would be very glad about any hints for the formulas SPSS uses.
If I use the same data in Stata 9 I get different results for the test.
Stata uses the Royston correction, but what about SPSS?

Best regards,

Michael

[Daniel Robertson]

Michael,

The link below will take you to the SPSS 14 algorithm documentation for
the EXAMINE procedure -- pp. 10-12 describe the Shapiro-Wilk test for
normality. Hope this helps,

http://support.spss.com/Tech/Products/SPSS/Documentation/Statistics/algorithms/14.0/examine.pdf

Dan R.

Michael Stobernack wrote:

> Dear all,
>
> in SPSS 14 there is a possibility to run the shapiro-wilk test for
> normality.
> I tried to find a technical description of the formulas at
> h t t
> p
> ://support.spss.com/Tech/Products/SPSS/Documentation/Statistics/algorithms/index.html
>
> But I couldn't find it.
> I would be very glad about any hints for the formulas SPSS uses.
> If I use the same data in Stata 9 I get different results for the test.
> Stata uses the Royston correction, but what about SPSS?
>
> Best regards,
>
> Michael
>

--
Daniel Robertson
Sr. Research and Planning Associate
Institutional Research and Planning
Cornell University
440 Day Hall, Ithaca NY 14853-2801
ph:607.255.9642 / irp.cornell.edu

[Daniel Robertson]

As far as I am aware, a maintenance contact has never been required to
access the documentation on the SPSS website. Anyone may log in using
'guest' as username and 'guest' as password.

Quoting from <http://support.spss.com/setGuest.asp>:

"SPSS Limited Access Login

Limited access provides the ability to search the Knowledgebase but does
NOT allow the site to be personalized in any manner. Limited access usage
does NOT allow submission of cases to SPSS Technical Support via the web
site or monitoring of cases opened to an SPSS Technical Support
Representative in any other manner."

That's how it works. All the documentation is there for free.

Dan R.

> Only if you have a maintenance contract with SPPS
> Outrageous if users have to pay extra for this key information
> [there may be another route in]
> diana
>
>
> On 4/5/07 20:44, "Daniel Robertson" <[hidden email]> wrote:
>
>> Michael,
>>
>> The link below will take you to the SPSS 14 algorithm documentation for
>> the EXAMINE procedure -- pp. 10-12 describe the Shapiro-Wilk test for
>> normality. Hope this helps,
>>
>> http://support.spss.com/Tech/Products/SPSS/Documentation/Statistics/algorithms
>> /14.0/examine.pdf
>>
>> Dan R.
>>
>> Michael Stobernack wrote:
>>> > Dear all,
>>> >
>>> > in SPSS 14 there is a possibility to run the shapiro-wilk test for
>>> > normality.
>>> > I tried to find a technical description of the formulas at
>>> > h t t
>>> > p
>>> >
>>> ://support.spss.com/Tech/Products/SPSS/Documentation/Statistics/algorithms/in
>>> dex.html
>>> >
>>> > But I couldn't find it.
>>> > I would be very glad about any hints for the formulas SPSS uses.
>>> > If I use the same data in Stata 9 I get different results for the
>>> test.
>>> > Stata uses the Royston correction, but what about SPSS?
>>> >
>>> > Best regards,
>>> >
>>> > Michael
>>> >
>>
>> --
>> Daniel Robertson
>> Sr. Research and Planning Associate
>> Institutional Research and Planning
>> Cornell University
>> 440 Day Hall, Ithaca NY 14853-2801
>> ph:607.255.9642 / irp.cornell.edu
>>
>
>
> Professor Diana Kornbrot
> Evaluation Co-ordinator, Blended Learning Unit
> University of Hertfordshire
> College Lane, Hatfield, Hertfordshire AL10 9AB, UK
>
> email:  [hidden email]
> web:    http://web.mac.com/kornbrot/iweb/KornbrotHome.html
>
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--
Daniel Robertson
Senior Research and Planning Associate
Institutional Research and Planning
Cornell University, Ithaca NY, 14853-2810
[hidden email] / ph:607.255.9642