topn {lago}R Documentation

Top n

Description

Reports the number of hits among the top-n ranked items.

Usage

## use default LAGO to rank items
obj <- sLago(Y,X)
s <- rank.sLago(obj,Xnew)

## evaluate its performance by average precision
topn(y=Ynew, phat=s, n=10)

Arguments

y a vector of binary responses.
phat a vector of rankings. Often, one may want to use posterior probabilities to rank items, but any monotonic transformation of posterior probabilities will, of course, give the same ranking.
n an integer indicating how many top ranked items to evaluate.

Author(s)

Mu Zhu, University of Waterloo, Canada.

See Also

avgp, tuneLago


[Package lago version 0.1-1 Index]