Nielsen rolls out changes to make its ratings more accurate, including using data from smartwatch-like devices worn by its panelists without requiring logins (Loree Seitz/The Wrap)

Loree Seitz / The Wrap : Nielsen rolls out changes to make its ratings more accurate, including using data from smartwatch-like devices worn by its panelists without requiring logins — “We are relentless in our pursuit of delivering the most accurate measurement possible for our media and advertising clients,” CEO Karthik Rao says