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. Author manuscript; available in PMC: 2017 Nov 1.

Published in final edited form as: J Exp Anal Behav. 2016 Nov;106(3):242–253. doi: 10.1002/jeab.228

Fig. 1 — Checking functional form of the price variable in the logistic regression component of the two-part mixed effects model for the Enhanced Quit & Win data. Panel A: cumulative residuals of the model fitted with untransformed price, p (solid line is for the observed data, dashed lines are 20 random samples of 10,000 simulated datasets based on the tested functional form); Panel B: cumulative residuals of the model fitted with transformed price, log (p + 0.001).

Fig. 1 — Checking functional form of the price variable in the logistic regression component of the two-part mixed effects model for the Enhanced Quit & Win data. Panel A: cumulative residuals of the model fitted with untransformed price, p (solid line is for the observed data, dashed lines are 20 random samples of 10,000 simulated datasets based on the tested functional form); Panel B: cumulative residuals of the model fitted with transformed price, log (p + 0.001).