Table 3 List of mixed-effect model formulas. The abbreviation avg rain = average weekly rainfall and cml rain = Cumulative rainfall.

From: Wild chimpanzee termite mound inspections converge with the onset of rain

Model

model formulation

Distribution

Interactive terms

VIFs

1

Arrive with tool ~ avg rain * (cml rain + I(cml. rain2)) + (1|mound / subject)

Binomial

Yes (p = 0.012)

 < 1.3

2A

Inspect binomial ~ avg rain * (cml rain + I(cml rain2)) + (1|mound / subject)

Binomial

Yes (p < 0.001)

 < 1.3

2B

Inspect duration ~ avg rain + (cml rain + I(cml rain2)) + (1|mound / subject)

Gaussian

No (p = 0.28)

 < 1.2

3A

Fishing binomial ~ avg rain * (cml rain + I(cml rain2)) + (1|mound / subject)

Binomial

Yes (p < 0.001)

 < 1.5

3B

Fishing duration ~ avg rain + (cml rain + I(cml rain2)) + (1|mound / subject)

Gaussian

No (p = 0.808)

 < 1.2

3C

Fishing efficiency ~ avg rain + (cml rain + I(cml rain2)) + (1|mound / subject)

Gaussian

No (p = 0.181)

 < 1.2

  1. I() is a function in R that keeps operators within term (in this case ^2) as regular operators instead of special formula operators. ANOVA tests used to compare the fit of interactive versus non-interactive models with rainfall covariates.
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