A general method is formalised for the problem of making predictions for a fixed group of individual units, following a sequence of repeated measures on each. A review of some related work is undertaken and, using some of its terminology, the approach might be described as approximate...

When proposed new fraud detection systems are tested in revolving credit operations, a straightforward comparison of the observed fraud detection rates is subject to a selectivity bias that tends to favour the existing system. This bias arises from the fact that accounts are terminated when the...