Table 3 in A comparison of image and observer based aerial surveys of narwhal

Table 3. AIC values after fitting explanatory variables to the DS and MR models. The final model chosen, Model 1, is given in bold and ΔAIC indicates the difference between the chosen model and the specified model. HN indicates a half-normal form and HR indicates a hazard-rate form for the DS model. The explanatory variables are perpendicular distance (D), group size (S), group size as a factor with three classes (1, 2–5, and ≥ 6 narwhals) (S3), Beaufort (BF), side of airplane (SP), observer pair (O), and time to next observation ≤ 10 s (T). Appendix S3 provides an overview of all the models that were developed. ModelDS modelMR modelNo. of parametersAICΔAIC1HN: D + BFD + O + S 351,330.9102HN: D + BFD + O + S51,332.811.903HN: D + BF + S3D + O + T61,333.102.194HN: D + BFD + O41,333.502.595HN: D + BF + S3D + O51,335.084.176HR: D + BFD + O + S351,336.976.06