. 2014 Mar 19;9(3):e91726. doi: 10.1371/journal.pone.0091726

Table 3. Definition of fitted mean logit path straightness models for observation j of turtle i.

Model
null
ecoregion
ecoregion + SST^a
ecoregion × SST^b
ecoregion + chla^a
ecoregion × chla^b
ecoregion + SSTg^b
ecoregion × SSTg^b
ecoregion + chlag^b
ecoregion × chlag^b
ecoregion + bathymetry^a
ecoregion × bathymetry^b
ecoregion + SST^a + bathymetry^a
ecoregion × SST^b + bathymetry^a*
ecoregion + chla^a + bathymetry^a
ecoregion × chla^b + bathymetry^a
ecoregion + SSTg^a + bathymetry^a
ecoregion × SSTg^b + bathymetry^a
ecoregion + chlag^a + bathymetry^a
ecoregion × chlag^b + bathymetry^a

Turtle i is in ecoregion r_ij at observation j, I(x) is an indicator function equaling 1 when x is true and 0 otherwise. There are K ecoregions, and K_SST, K_SSTg, K_chla, K_chlag, and K_bathy are the number of ecoregions where SST, SSTg, chla, chlag, and bathy effects are allowed. The variance structure is the same for all models.

Slopes held constant in regions of interest.

Slopes and intercepts allowed to vary in regions of interest.