[R] Help: lda predict

[Shengzhe Wu]

Hello,

I use lda (package: MASS) to obtain a lda object, then want to employ
this object to do the prediction for the new data like below:

predict(object, newdata, dimen=1, method=c("plug-in", "predictive", "debiased"))

What is the exact difference among the three methods? What is the
difference of prediction results when applying different method?

Thank you,
Shengzhe