Makes a prediction on new data given a fitted BART model for regression or classification.
# S3 method for bartMachine
predict(object, new_data, type = "prob", prob_rule_class = NULL, verbose = TRUE, ...)An object of class ``bartMachine''.
A data frame where each row is an observation to predict. The column names should be the same as the column names of the training data.
Only relevant if the bartMachine model is classification. The type can be ``prob'' which will
return the estimate of \(P(Y = 1)\)(the ``positive'' class) or ``class'' which will return the best guess as to the
class of the object, in the original label, based on if the probability estimate is greater
than prob_rule_class. Default is ``prob.''
The rule to determine when the class estimate is \(Y = 1\) (the ``positive'' class) based on the probability estimate. This
defaults to what was originally specified in the bart_machine object.
Prints out prediction-related messages. Currently in use only for probability predictions to let the user know which class
is being predicted. Default is TRUE.
Parameters that are ignored.
If regression, a numeric vector of y_hat, the best guess as to the response. If classification and type = ``prob'',
a numeric vector of p_hat, the best guess as to the probability of the response class being the ''positive'' class. If classification and
type = ''class'', a character vector of the best guess of the response's class labels.
# NOT RUN {
#Regression example
# }
# NOT RUN {
#generate Friedman data
set.seed(11)
n = 200
p = 5
X = data.frame(matrix(runif(n * p), ncol = p))
y = 10 * sin(pi* X[ ,1] * X[,2]) +20 * (X[,3] -.5)^2 + 10 * X[ ,4] + 5 * X[,5] + rnorm(n)
##build BART regression model
bart_machine = bartMachine(X, y)
##make predictions on the training data
y_hat = predict(bart_machine, X)
#Classification example
data(iris)
iris2 = iris[51 : 150, ] #do not include the third type of flower for this example
iris2$Species = factor(iris2$Species)
bart_machine = bartMachine(iris2[ ,1:4], iris2$Species)
##make probability predictions on the training data
p_hat = predict(bart_machine, X)
##make class predictions on test data
y_hat_class = predict(bart_machine, X, type = "class")
##make class predictions on test data conservatively for ''versicolor''
y_hat_class_conservative = predict(bart_machine, X, type = "class", prob_rule_class = 0.9)
# }
# NOT RUN {
# }