Example of an unsatisfactory piecewise regression curve fit to within-day weight data.

Weight data, collected on 29 April 2018 from a hive in the high treatment group, shown with two piecewise regression curve fits: a curve with 4 break points and a curve with 5 break points. Arrow indicates expected “dawn” (1st) break point. Note that the 2nd segment, typically associated with forager departure and therefore negative, is in this case positive.