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| File Information |
| Description |
This function provides a Wilcoxon-type test for trend across a group of three or more independent random samples.
Assumptions:
- Data must be at least ordinal
- Groups must be selected in a meaningful order i.e. ordered
If you do not choose to enter your own group scores then scores are allocated uniformly (1 ... n) in order of selection of the n groups.
The null hypothesis of no trend across the groups T will have mean E(T), variance var(T) and the null hypothesis is tested using the normalised test statistic z.
A logistic distribution is assumed for errors. Please note that this test is more powerful than the application of the Wilcoxon rank-sum/Mann-Whitney test between more than two groups of data.
Cuzick J. A Wilcoxon-Type Test for Trend. Statistics in Medicine
1985;4:87-89.
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| Required Products |
Statistics Toolbox
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| MATLAB release |
MATLAB 7.7 (R2008b)
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| Updates |
| 12 Nov 2008 |
Changes ih help section |
| 19 Nov 2008 |
logical indexinf improved |
| 19 Nov 2008 |
Statistics Toolbox is required |
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