Table 3. Testing for the effect of season and sex on redness of the pelvic spines.
Testing for effect of season and sex on intensity of red (IR) on the pelvic spines of three-spined sticklebacks. The table shows test statistics from a GLM type III (adjusted) sums of squares (SS) with “Intensity of red (IR)” as the response variable, and the predictors “sex” and “season” as fixed factors. Included are fish from Lake Pallvannet which could be categorized by sex by inspecting their gonads. “Season” is whether the fish were sampled during the spawning season (23 May) or 3–4 months after the end of the spawning season (7 October). The model explained 30.1% of the variation in the data (Adjusted R2 = 0.301).
| Source | SS | d.f. | F | P-value |
|---|---|---|---|---|
| Analysis of variance | ||||
| Sex | 0.012 | 1 | 20.864 | <0.001 |
| Season | 0.012 | 1 | 21.702 | <0.001 |
| Error | 0.060 | 105 | ||
| Total | 17.695 | 108 | ||