It’s a bit like guessing how many pennies are in a gallon jug at the state fair, but housing analysts keep trying to count how many foreclosed homes banks and mortgage investors own.

Why should we care? Unlike at the state fair, there is no prize for guessing right. Still, if we can track the number of these REO (“real estate owned”) homes, we can get some sense of how banks and others are doing in their efforts to dispose of the properties and how much longer they will be weighing on the housing market.