predict.bartMachine {bartMachine} | R Documentation |
Makes a prediction on new data given a fitted BART model for regression or classification.
## S3 method for class 'bartMachine' predict(object, new_data, type = "prob", prob_rule_class = NULL, verbose = TRUE, ...)
object |
An object of class “bartMachine”. |
new_data |
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. |
type |
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 |
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 |
verbose |
Prints out prediction-related messages. Currently in use only for probability predictions to let the user know which class
is being predicted. Default is |
... |
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.
Adam Kapelner and Justin Bleich
#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) ## End(Not run)