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A decision tree regression model produces at most as many possible predictions as it has terminal nodes/leaves. A well fit decision tree will have been limited in the number of terminal nodes/leaves, to prevent overfitting. A histogram of predicted values will have at most the same number of bins with non-zero values, while certain bins within the range of the target variable will have no predictions, creating a “step” like pattern that will not appear smooth.

do you know what this line means?

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