An Evaluation of Ad Hoc Presence-Only Data in Explaining Patterns of Distribution: Cetacean Sightings from Whale-Watching Vessels
Table 1
Explanatory factors initially included in the linear model. Use of continuous and discrete (category) variables follows suggestions of [14], where category variables are categorised in as few as possible meaningful categories, and ordinal variables are assumed to be continuous. Logistic variables are categorised as discrete with levels.
Factor
Variable type
Notes
Date
Continuous
From day 1 to day 158
Boat
Category ()
Differences in height of sighting platform; possible differences in acoustics of boat engines
