Chapter 12 Some Nonparametric Tests

Example 12.1 Absorption of calcium. Example 12.2 Reaction times for two groups of flies exposed to different levels of a nerve gas. Same data as in Example 2.5. Here analyzed by means of the Wilcoxon two-sample test. Example 12.3 Four groups of soys bean plants that are exposed to different treatments. The response is total area of the leaves. Same data as in Example 3.3. Here the data are used to illustrate the Kruskal-Wallis test. Example 6.1 The data are recordings of length and weight of two samples of the European common toad, Bufo bufo, that were taken in the same area, but on different dates. Here used to illustrate the Spearman rank correlation. Example 7.3 Connection between the shape of a stone and its weight. Here used to illustrate the Spearman rank correlation. Example 7.4 Pesticides in water. Here analyzed by means of the Wilcoxon two-sample test.