Naive Bayes Classifier predictions

```
# S3 method for NB
predict(object, newdata, expectation = NULL, threshold = c(0.001, 0.001), ...)
```

## Arguments

- object
density object

- newdata
new data on which to make predictions

- expectation
Variable to calculate conditional expectation wrt
probabilities from NB classifier

- threshold
Threshold parameters. First element defines the threshold
on the probabilities and the second element the value to set those
truncated probabilities to.

- ...
Additional arguments to lower level functions