1. A method for assessing wind turbine performance, the method comprising: pairing turbines of a plurality of wind turbines to generate one or more pairs of turbines; acquiring a set of concurrently acquired operational data for each pair of turbines; filtering the set of concurrently acquired operational data of each pair of turbines to generate a respective set of filtered data for each pair of turbines; and identifying low-performing turbines within some or all of the respective pairs of turbines based on the respective sets of filtered data.