Re: Curious about K-S test in NPTESTS

Posted by Beckstead, Jason on Dec 10, 2018; 1:49pm
URL: http://spssx-discussion.165.s1.nabble.com/Curious-about-K-S-test-in-NPTESTS-tp5737122p5737136.html

Thanks to all of you who have weighed in on this one.
BIG PICTURE: I am investigating how the use of different sets of verbal anchors for 5-point Likert-type response scales alter the distributions of the responses to items. I have 6 different sets of labels. I have 27 items that were used to create 6 versions of a questionnaire. Each questionnaire contained all 27 items but used a different set of verbal anchors for the 5-point scale. Students from a very large class were randomly assigned to complete one of the questionnaires. I have approximately 125 subjects in each of the 6 conditions.
Analysis plan: 1) for each item I am comparing the distribution of responses across conditions using a chi-square test. I am not using the linear-by-linear test, because it is my understanding that this test assumes that the distances between adjacent categories is equal.
2) also, I am conducting item-metric repeated measures ANOVAs. In this approach, the items are treated as the subjects (n=27). For each item I have computed standard deviation, skewness, and kurtosis. One ANOVA, for example, treats the standard deviations of the items a the DV. I repeat this type of analysis on the item-skewnesses, and on the kurtosis values.

Any comments, or suggestions welcome.
Jason


_____________________________________________________________
 Jason W. Beckstead, Ph.D.       
  Associate Professor/Quantitative Methodologist
  University of South Florida College of Public Health
  13201 Bruce B. Downs Blvd., MDC56, Tampa, FL 33612, USA
  Statistical Editor, International Journal of Nursing Studies
  phone: [phone]  fax: [phone]          
  personal website:  http://personal.health.usf.edu/jbeckste/
  International Journal of Nursing Studies  http://www.elsevier.com/ijns

-----Original Message-----
From: SPSSX(r) Discussion [mailto:[hidden email]] On Behalf Of Bruce Weaver
Sent: Monday, December 10, 2018 8:11 AM
To: [hidden email]
Subject: Re: Curious about K-S test in NPTESTS

Rich is right.  Here are the results of Howell's analysis on the data posted
in this thread.

Test                            Value df      p  Percent
Pearson Chi-Square             18.832  4   .001    100.0
Linear-by-Linear Association     .000  1  1.000       .0
Deviation from Linearity       18.832  3   .000    100.0



Rich Ulrich wrote

> I don't know why that particular comment from David Howell's page was
> included, but the test and p-value for non-linear component described the
> data on Howell's page.
>
> Applying the algorithm for "non-linear" to the artificial data from Jason
> -
> the linear component is exactly 0, so the achieved X2 value is also the
> 3-df  test, with smaller p-value because it has 3 df, not 4.
>
> Sad, about David.
>
> --
> Rich Ulrich

-----
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Bruce Weaver
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