hang on that beti trendline .... defn sloping down always .... so why 0? is offsetting to the trendline more a better measure?
What do you mean, I don't understand your question?
ok so the trend line in green of beti appears to be sloping down,
but the beti is quoted to against zero, but would you not have to move the zero the average of the beti or some such?
tl;dr where is your 0 and why?