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Results of the generalized linear mixed model analysis (GLMM; n = 12 962; random model: crab identity + bird identity). The model predicts the logarithm of the odds ratio; response probabilities are therefore predicted by p = (1 + Σiaiei)−1.
| fixed effects (xi) | effect (ai) | d.f. | χ2 | p |
|---|---|---|---|---|
| intercept | −4.99 | 1 | <1×10−15 | |
| horizon level (row ≤ 5) | 1.40 | 1 | 15.0 | <1×10−3 |
| flicker | 0.0202 | 1 | 29.3 | <1×10−7 |
| vert. ret. speed (omm s−1) | 0.841 | 1 | 14.6 | <1×10−3 |
| hor. ret. speed (omm s−1) | — | 1 | 2.82 | 0.093 |
