1. A subject monitoring pulse oximetry system for determining physiological information of a subject, comprising: a pulse oximetry sensor configured to detect light attenuated by the subject and generate a photoplethysmographic (PPG) signal based on the detected attenuated light; and a pulse oximeter coupled to the pulse oximetry sensor, wherein the pulse oximeter is configured to: store a rate algorithm; determine a skew metric based on the PPG signal; determine an algorithm setting based on a reference relationship between the determined skew metric and a value indicative of a physiological rate; apply the algorithm setting to the rate algorithm stored by the pulse oximeter; and determine the physiological information of the subject using the rate algorithm and the PPG signal, wherein the physiological information comprises pulse rate of the subject.