im trying to do my first "A/B test".. so far ive only found preview dot tinyurl dot-com-slash 39xn3tu (sorry this is my first post so im not allowed to post links) (anybody know of any better spreadsheet examples by the way?) how do i transform that one so it calculates the various ROIs of multiple banner ads, through multiple market segments (oversized women in new york, chicago and los angeles), through various times of the day, through various times of the year? Thank y'all, Tony