predict.brmultinom {brglm2}  R Documentation 
Predict method for brmultinom fits
Description
Obtain class and probability predictions from a fitted baseline category logits model.
Usage
## S3 method for class 'brmultinom'
predict(object, newdata, type = c("class", "probs"), ...)
Arguments
object 
a fitted object of class inheriting from

newdata 
optionally, a data frame in which to look for variables with which to predict. If omitted, the fitted linear predictors are used. 
type 
the type of prediction required. The default is

... 
further arguments passed to or from other methods. 
Details
If newdata
is omitted the predictions are based on the data used
for the fit.
Value
If type = "class"
a vector with the predicted response
categories; if type = "probs"
a matrix of probabilities for all
response categories at newdata
.
Examples
data("housing", package = "MASS")
# Maximum likelihood using brmultinom with baseline category 'Low'
houseML1 < brmultinom(Sat ~ Infl + Type + Cont, weights = Freq,
data = housing, type = "ML", ref = 1)
# New data
newdata < expand.grid(Infl = c("Low", "Medium"),
Type = c("Tower", "Atrium", "Terrace"),
Cont = c("Low", NA, "High"))
## Predictions
sapply(c("class", "probs"), function(what) predict(houseML1, newdata, what))