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Table 1 Ordinal logistic regression analysis of the importance of different factors in the main experiment.

From: Diversity and specificity in the interaction between Caenorhabditis elegans and the pathogen Serratia marcescens

Source

χ 2

d.f.

P

Consideration of worm strains as a factor

Bacteria

272.78

4

< 0.0001

Worm

188.11

7

< 0.0001

Bacteria*Worm

127.15

28

< 0.0001

Run [Bacteria, Worm]

835.27

160

< 0.0001

Consideration of worm genotypes as a factor

Bacteria

193.77

4

< 0.0001

Worm

169.87

3

< 0.0001

Bacteria*Worm

34.21

12

0.0006

Run [Bacteria, Worm]

477.14

80

< 0.0001

  1. Ordinal logistic regression was based on a model, which contained bacterial strain, worm strain (alternatively worm genotype), the interaction between the two and run nested within both bacterial strain and worm strain/genotype as factors. The importance of different factors was assessed with the likelihood ratio test. Significant probabilities after Dunn-Sidák correction are given in bold.