Fig. 3: Odds ratios based on the CPPO model.
From: Prediction of quality of life in early breast cancer upon completion of adjuvant chemotherapy
HDI highest density interval, ALND axillary lymph node dissection, TNM tumor-node-metastases, OR odds ratio. Note: odds ratios are based on posterior mode parameters, also displaying the 0.95 highest posterior density intervals. The shades of blue represent different cutoffs of the response variable (health status at 6 months). The plot reveals the linear constrained effect on the predictors. We can see that the CPPO model assumes proportional odds for all variables, except for baseline QoL and age (that interacts with surgery). The model imposes a linear restriction on the coefficients of these variables that do not meet the proportional odds assumption with respect to cutoffs. In contrast, the variables that do meet the proportional odds assumption have a single odds ratio that is valid for the entire range of possible cutoffs.
