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gbmFit.ada = gbm(formula = ylearn ~.,
distribution = 'adaboost',
data = xlearn,
n.trees = 10000, #the number of trees in the model
interaction.depth = 5, #each tree will evaluate five decisions
n.minobsinnode = 2, #the number of obs present to yield a terminal node, higher means more conservative fit
shrinkage = .01, #the learning rate, dictates how fast the algorithm moves across the loss gradient
bag.fraction = 0.5, #subsampling fraction, 0.5 is best
train.fraction = 0.8, #fraction of data for training
cv.folds = 5) #running five-fold cross-validation
test_data$preds_ada = predict(gbmFit.ada, test_data, n.trees = best.cv.ada, type = 'response')
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