Brian S. Everitt A Handbook of Statistical Analyses using SPSS

Table 5.4 Postdexamethasone Cortisol Levels
Control
Major
Depression
Bipolar
Depression Schizophrenia Atypical
1.0 1.0 1.0 0.5 0.9
1.0 3.0 1.0 0.5 1.3
1.0 3.5 1.0 1.0 1.5
1.5 4.0 1.5 1.0 4.8
1.5 10.0 2.0 1.0
1.5 12.5 2.5 1.0
1.5 14.0 2.5 1.5
1.5 15.0 5.5 1.5
1.5 17.5 1.5
1.5 18.0 2.0
1.5 20.0 2.5
1.5 21.0 2.5
1.5 24.5 2.5
2.0 25.0 11.2
2.0
2.0
2.0
2.0
2.0
2.0
2.0
2.5
2.5
3.0
3.0
3.0
3.5
3.5
4.0
4.5
10.0
Source: Hand et al., 1994.
Use one-way analysis of variance to assess whether there is any difference
between the five groups in average cortisol level.
A nonparametric alternative to one-way ANOVA is given by the Kruskal-
Wallis test. This extends the Mann-Whitney U-test described in Chapter 2,
Box 2.2, to more than two groups. Use some initial graphical analyses of
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