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Table 2 Parameter statistics for the fixed effects terms of the diel displacement (DD) model

From: Using diel movement behavior to infer foraging strategies related to ecological and social factors in elephants

Parameter Estimate SE t-value χ 2 df P-value
Intercept 1.04 0.05 22.18 2097.17† 9 <0.01
NDVI 0.38 0.07 5.6 *   
Rank medium 0.08 0.05 1.46 *   
Rank variable -0.05 0.07 -0.75 *   
Rank high -0.18 0.05 -3.83 *   
NDVI: Rank medium -0.05 0.1 -0.54 *   
NDVI: Rank variable 0.02 0.12 0.19 *   
NDVI: Rank high 0.23 0.08 2.82 15.46†† 3 <0.01
1 day lag term 0.19 0.01 17.26 589.36††† 1 <0.01
2 day lag term 0.31 0.01 27.59 722.45†††† 1 <0.01
  1. The overall reference intercept parameter corresponds to the low ranking individuals, to which rank parameter terms are added to obtain rank specific intercepts. χ2 values show the likelihood ratio test, with degrees of freedom (df) and associated P-value. :- indicates interaction term. *- Significance test not meaningful for single terms involved in significant interactions. † - Significance test of the full model against a null model with only an individual random effect term. †† - Test of the significance of the interaction term against the reduced model that includes both rank and NDVI but not their interaction. ††† - Test of whether the 1 day lag term is needed against a model with no lag terms. †††† - Test of whether a second lag term is needed.