the sum of the viewer ratings of the ads. • Individual-wise GRP is calculated for each age and gender groups of viewers. example) Mon Tue Wed Thu Fri part1 10% 25% 20% 15% 12% part2 15% 18% 17% 21% 10% Viewer rating: male (age: 20-34) … broadcasting GRP (male, age: 30-34) = 18 + 17 + 21 = 56 Mon Tue Wed Thu Fri part1 19% 25% 20% 15% 12% part2 10% 11% 22% 25% 10% Viewer rating: female (age: 35-49) GRP (female, age: 35-49) = 11 + 22 + 25 = 58 19