Table 1.
Results of mixed effects regressions predicting median and 90th percentile values of vocal foraging measures, as well as parameters of probability distributions of vocal foraging measures, as a function of whether a response was recently received, infant age, and sample size, with infant ID as a random effect.
| Dependent variable | Response effect | Age effect | Sample size effect |
|---|---|---|---|
| Inf. acoustic step size (median) | −0.02 (p = 0.85) | 0.15 (p = 0.02) | −0.31 (p < 0.001) |
| Inf. acoustic step size (90th perc.) | −0.18 (p = 0.13) | 0.09 (p = 0.14) | −0.24 (p = 0.002) |
| Inf. acoustic step size (lognormal μ) | 0.01 (p = 0.93) | 0.12 (p = 0.06) | −0.30 (p < 0.001) |
| Inf. acoustic step size (lognormal σ) | −0.41 (p < 0.001) | 0.02 (p = 0.70) | 0.18 (p = 0.04) |
| Inf. inter-voc. interval (median) | −0.25 (p = 0.01) | 0.06 (p = 0.22) | −0.62 (p < 0.001) |
| Inf. inter-voc. interval (90th perc.) | −0.11 (p = 0.24) | 0.004 (p = 0.94) | −0.57 (p = 0.01) |
| Inf. inter-voc. interval (lognormal μ) | −0.19 (p = 0.01) | 0.03 (p = 0.52) | −0.78 (p < 0.001) |
| Inf. inter-voc. interval (lognormal σ) | −0.43 (p < 0.001) | 0.01 (p = 0.76) | −0.76 (p < 0.001) |
| Ad. acoustic step size (median) | 0.24 (p = 0.01) | 0.39 (p < 0.001) | 0.07 (p = 0.23) |
| Ad. acoustic step size (90th perc.) | 0.02 (p = 0.83) | 0.29 (p < 0.001) | 0.19 (p = 0.01) |
| Ad. acoustic step size (lognormal μ) | 0.26 (p = 0.003) | 0.46 (p < 0.001) | 0.05 (p = 0.47) |
| Ad. acoustic step size (lognormal σ) | −0.61 (p < 0.001) | −0.16 (p = 0.01) | 0.12 (p = 0.11) |
| Ad. inter-voc. interval (median) | 0.16 (p = 0.05)* | 0.22 (p < 0.001) | −0.45 (p < 0.001) |
| Ad. inter-voc. interval (90th perc.) | −0.07 (p = 0.46) | 0.04 (p = 0.43) | −0.50 (p < 0.001) |
| Ad. inter-voc. interval (pareto xmin) | 0.65 (p < 0.001) | −0.003 (p = 0.96) | −0.04 (p = 0.50) |
| Ad. inter-voc. interval (pareto α) | 0.30 (p < 0.001) | −0.24 (p < 0.001) | 0.37 (p < 0.001) |
The β values are given with the p values in brackets. Significant effects (at a significance level of 0.05) are indicated in bold. All values reported have been rounded to two decimal points wherever possible.
*The p-value here is actually 0.0479 and has been rounded to 0.05, which is why it is in bold, indicating significance.