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.
After revision:  In particular, we demonstrate that the proposed approach has an average error less than 2.5 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.