Ecological Archives E086-156-A1

Ian D. Jonsen, Joanna Mills Flemming, and Ransom A. Myers. 2005. Robust state–space modeling of animal movement data. Ecology 86:2874–2880.

Appendix A. A figure (Fig. A1) showing likelihood surface plots and maximum-likelihood point estimates of Argos error distribution parameters and a table (Table A1) showing maximum-likelihood estimates of t distribution parameters fit to Argos data.

 
   FIG. A1. Joint log-likelihood surface plots for t-distribution parameters,  and nu, for longitude and latitude. Argos location quality class is indicated in the lower right corner of each panel. The 95 % confidence region on each panel is indicated by the gray-shaded region. Maximum-likelihood point estimates for  and nu are indicated by the filled circles. The contour interval is -1 moving away from the maximum-likelihood point estimate. Note the different axis scales on the panels.


TABLE A1. Maximum-likelihood estimates and standard errors of t-distribution parameters fit to Argos data from (Vincent et. al. 2002). The scale parameters  and  denote longitude and latitude, respectively. Similarly, nu_lon and nu_lat are the degrees of freedom for longitude and latitude, respectively. mu_lon and mu_lat are fixed at the known location of the caged seals. Units for the 's are in kilometers.

Quality
class
Longitude
Latitude
(SE)
nu_lon (SE)
(SE)
nu_lat (SE)
B 4.205 (0.684) 1.079 (0.190) 3.041 (0.434) 1.331 (0.246)
A 0.507 (0.100) 0.787 (0.133) 0.510 (0.082) 1.058 (0.188)
0 2.163 (0.518) 0.914 (0.211) 1.607 (0.324)  1.011 (0.221)
1 0.902 (0.181) 2.299 (0.941) 0.460 (0.092) 3.896 (2.607)
2 0.312 (0.067) 1.221 (0.321) 0.260 (0.037) 6.315 (4.145)
3 0.290 (0.098) 3.071 (2.795) 0.122 (0.037) 2.076 (1.167)


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