1. A method for evaluating therapy comprising: monitoring a signal generated by a sensor as a function of posture of a patient; identifying a plurality of posture events based on the signal; associating each of the posture events with a therapy parameter set currently used by a medical device to deliver a therapy to the patient when the posture event is identified, wherein the therapy comprises at least one of a movement disorder therapy, psychological disorder therapy, or deep brain stimulation; and determining a value of a posture metric for each of a plurality of therapy parameter sets based posture events associated with the therapy parameter sets.