Table 1.
Estimates of the final model investigating impact of male song traits on reproductive success (clutch size)
| Fixed effects | Random effects | |||||
|---|---|---|---|---|---|---|
| Variable | Estimate | T | 2.5% CI | 97.5% CI | Variable | Variance (SD) |
| Intercept | 9.597 | 35.698 | 9.077 | 10.12 | Individual | 0.61 (0.78) |
| Date of first egg (days from 1st of April) | −1.039 | −5.762 | −1.388 | −0.691 | Residual | 1.34 (1.16) |
| Vocal consistency | 0.367 | 2.639 | 0.098 | 0.635 | ||
| Year (2019) | −0.749 | −1.941 | −1.493 | −0.004 | ||
| Year (2020) | −1.725 | −4.037 | −2.552 | −0.897 | ||
For each fixed effect we show the model estimate, representing the size and direction of the effect, the T statistic and the 95% CI around the estimate. Vocal consistency had a positive significant effect on clutch size as the 95% CI do not overlap with zero. The marginal R squared (R2m) of the full model was 0.32 and the conditional R-squared represented (R2c) was 0.53. These indicate the goodness of fit of the model considering just the fixed effects (R2m) and including both fixed and random effects (R2c). The estimated variance and the standard deviation (SD) explained by the random effects are shown in the last two columns.