Filters EP metrics by metric type.
One of AEP (aggregate EP), CEP (stochastic conditional EP), OEP (occurence EP), TCE-AEP (tail conditional expectation AEP), TCE-OEP (tail conditional expectation OEP), Smoothed-AEP (smoothed aggregate EP), Smoothed-OEP (smoothed occurence EP).
Smoothed-AEP and Smoothed-OEP are returned only when the marginal impact analysis was run with smoothed results enabled.