Department| Volume 97, ISSUE 1, P178, January 2016

# Correction

In the article “Acceleration Metrics Are Responsive to Change in Upper Extremity Function of Stroke Survivors” (Urbin et al, Arch Phys Med Rehabil 2015;96:854-61), the incorrect equation is listed for magnitude ratio in Appendix 1. The correct equation is shown below.
$=x˜(epochvalue1paretic/epochvalue1non-paretic⋯epochvalueiparetic/epochvalueinon-paretic)$