So I now know that 15 degree of roll may occur so many percentage of time 10 degree, may occur, so many percentage of time. So, I can find out what is my total probability of certain roll occurring, response occurring yes, this is the idea because there are two way therefore, the probability one is that given time the waves are continuously changing, so I get H s, but then I have taken the data today for 2 hours, so I found H s from the