[rules-users] Using rules engine to find patterns in time series data

I'm looking at the rules engine as a mechanism to find patterns in some time series data. I'm looking for things like there where N spikes above a certain threshold value in a certain period of time. I was wondering if anyone has done this, or have any ideas on how best to do this with the rules engine. My own ideas & the prototype I've built seem to be really procedural, so I'm wondering if there's a better way that I'm missing. Robert