This is the idealized distribution. It is constructed from the median initial slope, the median breakpoint, and the median second slope. After documenting what did in fact happen as the result of changes in the schedule and reinforcement rate, the next obvious step is to determine the most appropriate model for that within-session rate change. Each model was fit to the within-session rate change for each of the 12 birds under each of the 15 procedures. The reduced chi-squared for each model for each procedure is reported as a column of dots for each schedule.
Lower numbers are better fits.
The 4 frames represent the fits made by the 4 models. The 15 columns in each frame denote the 15 procedures. The 12 dots in each column depict the quality of fit for the 12 birds under that condition. As can be seen, the simple straight line does nearly as well as the other fits and that the two straight does approximately the best. All 4 models do the worst with the VI behavior across the session.