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Jonckheere-Terpstra test on trend

19 Nov 2008 (Updated 20 Nov 2008)

A nonparametric Test for Trend

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Description	There are situations in which treatments are ordered in some way, for example the increasing dosages of a drug. In these cases a test with the more specific alternative hypothesis that the population medians are ordered in a particular direction may be required. For example, the alternative hypothesis could be as follows: population median1 <= population median2 <= population median3. This is a one-tail test, and reversing the inequalities gives an analagous test in the opposite tail. Here, the Jonckheere–Terpstra test can be used. Bewick V., Cheek L., Ball J. Statistics review 10: further nonparametric methods. Critical Care 2004, 8: 196-199
Required Products	Statistics Toolbox
MATLAB release	MATLAB 7.6 (R2008a)

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20 Nov 2008	Changes in help section
20 Nov 2008	correction in input error handling typo error

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