A Day of evaluating Competitive Advantage Period

I committed my whole day to evaluate the CAP(competitive advantage period) , but I haven't got any satisfied result until now. There must be something wrong which I haven't found out yet in the data processing. This almost drove me crazy. Totally.
Yea I know it's no use complaining, and the only thing I should do is to go on computing it over and over again with displacing the data. Jesus, it is definitely a real big torture.