Fig. 4. Classification tree analysis of the responses to the question: “If coffee prices increased would you expand onto the remaining forest in your property to cultivate shade coffee?” (Y = yes, N = no, 35 samples). Percentage of remaining forest within properties (node 2), and change in the percentage of land used for coffee cultivation during a ten-year period (node 3) were the most important explanatory variables. The misclassification rate of the model built with the training data was 17% while the misclassification rate of the validation model was 40%.