2009/8/21 Anthony wikimail@inbox.org:
"Is this article vandalized?" is a yes/no question...
True, but that isn't actually the question that this research tried to answer. It tried to answer "How much time has this article spent in a vandalised state?". If we are only interested in whether the most recent revision is vandalised then that is a simpler problem but would require a much larger sample to get the same quality of data.