Before revision:  In particular, we demonstrate that the proposed approach has an average error of 4 cm/sec using data collected over a 5 year period from 76 study participants monitored both in their own homes and within a clinical setting. The proposed method is simple and cost effective , and has advantages over competing approaches such as not requiring patients to wear a device or needing dedicated sensors to measure gait .
After revision:  In particular, we demonstrate that the proposed approach has an average error of 4 cm/sec using data collected over a 5 year period from 76 study participants monitored both in their own homes . This method is simple and cost effective , and has advantages over competing approaches such as not requiring patients to wear a device or needing dedicated sensors to measure gait .