Re: Shapiro-Wilks Statistic
Posted by
Jon Peck on
URL: http://spssx-discussion.165.s1.nabble.com/Shapiro-Wilks-Statistic-tp5739693p5739700.html
You might consider as well the Anderson-Darling test. If you use the simulation procedure on your active file, you can choose the relevant variables and let the dialog fit the selected variables and choose the best one from a large number of possibilities,
Any tips on when to use the Shapiro-Wilk statistic over the Kolmogorov-Smirnov Statistic in testing normality?
Thank you.
Do not know if this is the case in Harley's situation, but there
are some requirements in order to produce the statistic. From syntax
guide(v27):
NPPLOT. Normal and detrended Q-Q plots with the Tests of Normality table
presenting Shapiro-Wilk's
statistic and a Kolmogorov-Smirnov statistic with a Lilliefors significance
level for testing normality. If noninteger
weights are specified, the Shapiro-Wilk's statistic is calculated when the
weighted sample size lies
between 3 and 50. For no weights or integer weights, the statistic is
calculated when the weighted
sample size lies between 3 and 5,000.
Tony Babinec
-----Original Message-----
From: SPSSX(r) Discussion <[hidden email]> On Behalf Of Bruce
Weaver
Sent: Wednesday, September 30, 2020 12:24 PM
To: [hidden email]
Subject: Re: Shapiro-Wilks Statistic
Hello Harley. I copied your syntax, changed F1 to the name of a variable in
the data file I had open, and ran it. The Tests of Normality table it
generated showed both K-S and S-W tests.
Why do you want to test for normality?
Baker, Harley wrote
> Colleagues,
>
> I am trying to get the Shapiro-Wilks Statistics and having a difficult
> time in SPSS v27 (Mac; release 27.0.0.0; 64-bit) running on Catalina.
> According to the manual, the following syntax (generated by
> point-and-click methods) should work. It produces the K-S test, but
> not W-S test:
>
> EXAMINE VARIABLES=F1
> /PLOT BOXPLOT HISTOGRAM NPPLOT
> /COMPARE GROUPS
> /MESTIMATORS HUBER(1.339) ANDREW(1.34) HAMPEL(1.7,3.4,8.5) TUKEY(4.685)
> /PERCENTILES(5,10,25,50,75,90,95) HAVERAGE
> /STATISTICS DESCRIPTIVES EXTREME
> /CINTERVAL 95
> /MISSING LISTWISE
> /NOTOTAL.
>
> What am I doing/not doing such that the Shapiro-Wilks test statistic
> is not produced? What do I do to fix it?
>
> Thanks!
>
> Harley
>
> Dr. Harley Baker
> Professor Emeritus of Psychology
> California State University Channel Islands One University Drive
> Camarillo, CA 93012
-----
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