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Nature Ecoogy & Evoution
Article https://doi.org/10.1038/s41559-024-02420-w
For the Cox regression models, we checked the assumption of
proportional hazards with a Schoenfeld test, which tests the null
hypothesis that there is no relationship between the scaled Schoen-
feld residuals and time. This test was non-significant (P > 0.05) for all
models, indicating no violation of the proportional hazards assump-
tion. For the Poisson regression model, we checked for overdispersion
using the AER package in R
59
. The dispersion parameter was estimated
to be 1.1, which did not differ significantly from the ideal value of 1
(P = 0.26), indicating that a Poisson distribution was appropriate. For
the linear regression model used to examine the change in vigilance
duration before versus after playbacks, visual inspection of the histo-
gram of the residuals indicated that the residuals were approximately
normally distributed. For treatment, distance, dBC, speaker location
and cumulative playback exposure, visual inspection of boxplots or
residual plots indicated approximate homoscedasticity. Relationship
of caller to original receiver and other adults were heteroscedastic.
However, regardless of whether these covariates were included, treat-
ment was not significant, so any potential issues with this model had
no bearing on the conclusions of our study.
Reporting summary
Further information on research design is available in the Nature
Portfolio Reporting Summary linked to this article.
Data availability
Data are available at https://doi.org/10.5061/dryad.hmgqnk9nj (ref. 60).
Code availability
Code is available at https://doi.org/10.5281/zenodo.10576772 (ref. 61).
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