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Topic: multiple comparison with ambiguous ranks
Replies: 9   Last Post: Mar 13, 2013 4:46 PM

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 Art Kendall Posts: 200 Registered: 12/7/04
Re: multiple comparison with ambiguous ranks
Posted: Mar 12, 2013 12:39 PM

Please explain you data in more detail.
One variable is condition (an at least ordinal variable).
You want to relate condition to some other variables.
What are the other variables and how are they measured?

What questions are you trying to answer with the data?

Art Kendall
Social Research Consultants

On 3/12/2013 11:19 AM, Da wrote:
> For a clinical study, I have patient's health condition labeled as grade 1, 2, or 3. Some patients are labeled as "Either 1 or 2" by the doctor, meaning the doctor considers both grade 1 and 2 as valid descriptions of the health condition.
>
> When performing say a Kruskal Wallis test, I don't want to consider such patients as a separate group. What I wish to do is to run K-W test multiple times, each time using either 1 or 2 as rank, and report the final result based on the test with the lowest p-value.
>
> However, doing this would be slow, as I have 20 patients with such label, so I need to run K-W Test 2^20 times.
>
> Any suggestions?
> Thanks
>

Date Subject Author
3/12/13 Art Kendall
3/12/13 Art Kendall
3/12/13 Richard Ulrich
3/12/13 Ray Koopman
3/13/13 Richard Ulrich
3/13/13 Ray Koopman
3/13/13 Bruce Weaver
3/13/13 Art Kendall
3/13/13 Bruce Weaver