Social effects on survival. The only social effect considered in this model was the survival of other squirrels in the population. Survival of other squirrels was coded as survived (0.5) and died (−0.5), such that survival and mortality of other squirrels were equally distance-weighted
| Variable . | Estimate ± SE . | Z value . | P . |
|---|---|---|---|
| Intercept | 0.73 ± 0.16 | 4.48 | <0.0001 |
| Age | 0.34 ± 0.08 | 4.13 | <0.0001 |
| Age2 | −0.09 ± 0.01 | −6.89 | <0.0001 |
| Study area (SU) | 0.11 ± 0.07 | 1.66 | 0.10 |
| Survival of other squirrels | −0.16 ± 0.05 | −2.98 | 0.003 |
| Mast (yes) | −0.39 ± 0.24 | −1.62 | 0.11 |
| Mast (yes) × survival of other squirrels | 0.05 ± 0.12 | 0.41 | 0.68 |
| Variable . | Estimate ± SE . | Z value . | P . |
|---|---|---|---|
| Intercept | 0.73 ± 0.16 | 4.48 | <0.0001 |
| Age | 0.34 ± 0.08 | 4.13 | <0.0001 |
| Age2 | −0.09 ± 0.01 | −6.89 | <0.0001 |
| Study area (SU) | 0.11 ± 0.07 | 1.66 | 0.10 |
| Survival of other squirrels | −0.16 ± 0.05 | −2.98 | 0.003 |
| Mast (yes) | −0.39 ± 0.24 | −1.62 | 0.11 |
| Mast (yes) × survival of other squirrels | 0.05 ± 0.12 | 0.41 | 0.68 |
Continuous fixed effects were standardized to a mean of zero and unit variance prior to analysis. For nominal fixed effects, the level corresponding to the parameter is specified. The fitted model was a generalized linear mixed-effect model with a binomial error distribution and a logit link function. This model was based on 4834 observations of 1761 squirrels in 31 years. Residual deviance = 5557; residual df = 4825. Random effects: among-squirrel variance = 0.08; among-year variance in survival = 0.03; among-year variance = 0.25.
Social effects on survival. The only social effect considered in this model was the survival of other squirrels in the population. Survival of other squirrels was coded as survived (0.5) and died (−0.5), such that survival and mortality of other squirrels were equally distance-weighted
| Variable . | Estimate ± SE . | Z value . | P . |
|---|---|---|---|
| Intercept | 0.73 ± 0.16 | 4.48 | <0.0001 |
| Age | 0.34 ± 0.08 | 4.13 | <0.0001 |
| Age2 | −0.09 ± 0.01 | −6.89 | <0.0001 |
| Study area (SU) | 0.11 ± 0.07 | 1.66 | 0.10 |
| Survival of other squirrels | −0.16 ± 0.05 | −2.98 | 0.003 |
| Mast (yes) | −0.39 ± 0.24 | −1.62 | 0.11 |
| Mast (yes) × survival of other squirrels | 0.05 ± 0.12 | 0.41 | 0.68 |
| Variable . | Estimate ± SE . | Z value . | P . |
|---|---|---|---|
| Intercept | 0.73 ± 0.16 | 4.48 | <0.0001 |
| Age | 0.34 ± 0.08 | 4.13 | <0.0001 |
| Age2 | −0.09 ± 0.01 | −6.89 | <0.0001 |
| Study area (SU) | 0.11 ± 0.07 | 1.66 | 0.10 |
| Survival of other squirrels | −0.16 ± 0.05 | −2.98 | 0.003 |
| Mast (yes) | −0.39 ± 0.24 | −1.62 | 0.11 |
| Mast (yes) × survival of other squirrels | 0.05 ± 0.12 | 0.41 | 0.68 |
Continuous fixed effects were standardized to a mean of zero and unit variance prior to analysis. For nominal fixed effects, the level corresponding to the parameter is specified. The fitted model was a generalized linear mixed-effect model with a binomial error distribution and a logit link function. This model was based on 4834 observations of 1761 squirrels in 31 years. Residual deviance = 5557; residual df = 4825. Random effects: among-squirrel variance = 0.08; among-year variance in survival = 0.03; among-year variance = 0.25.
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