# Probe List Correlation Filter

Where you have several datastores and a probe list which shows a concerted pattern of quantitation across those stores (for example a cluster group defined by the correlation cluster filter) you can use the probe list correlation filter to take the average quantitation profile from this list and search for other probes which have a correlated quantitation profile

This filter would be useful where you initially used a stringent subset of genes to create initial clusters, but later wanted to expand the coverage to a larger set of probes.

## Options

- You can choose which data stores you want to use for your correlation. You must choose at least 3 stores and there is no upper limit to the number you choose.
- You must choose the probe list you want to use as your reference for your quantitation profile.
- You can choose how correlated a probe has to be to the reference profile in order to be included in the filtered output. If you specify a negative R value then the filter will search for correlation less than that value, so this becomes an anti-correlation filter