Trp value

How is trp valued? More the cry? Or more the happy? Don't understand? Bcos i see ppl say boring if the cry scene or abusive scene comes..then how they validate the rating? Don't understand? Twist part ppl really enjoy and the eagerness to watch the show increases.. That is ok.. BUT tragedy part really they don't like to watch..some orthodox ppl even change the channel if death scene comes..as it is not good for house.