The original AdaBoost ("adaptive boosting") algorithm is a binary classification technique (predicting a variable that has two possible values, such as the sex of a person). The AdaBoost.R2 ("AdaBoost ...

For example, if you have a predictor variable color with possible encoded values red = 0, blue = 1, green = 2, red will always be less-than-or-equal to any other color value in the decision tree ...