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Table 2 Results of the general linear models for mean life span (ANOVA) and the two Gompertz mortality parameters (α, baseline mortality rate, and β, rate of senescence) combined (MANOVA).

From: An experimental test for indirect benefits in Drosophila melanogaster

  Mean life span Mortality parameters
Source of variation df SS F p Wilks' λ df p
Females        
treatment 1 1.503 0.24 0.625 0.973 2, 26 0.701
milieu 1 356.3 58.01 <0.0001 0.260 2, 26 <0.0001
treatment × milieu 1 3.893 0.63 0.433 0.990 2, 26 0.872
error 27* 529.4      
Males        
treatment 1 4.022 1.18 0.287 0.874 2, 27 0.161
milieu 1 5.406 1.59 0.218 0.700 2, 27 0.0081
treatment × milieu 1 8.977 2.63 0.116 0.684 2, 27 0.0059
error 28 95.41      
  1. *one cage of females (stud, single sex) was lost due to experimental error.
  2. Sources of variation include treatment (stud vs. dud ancestry), milieu (single vs. mixed sexes), and their interaction.