A Rebuy ? for Math Majors

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EDIT: I think ROI is a pretty useless statistic when calculating profitability, it's all about EV and SD.

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ROI IS EV. you just have to make sure the units are the same. ROI uses buuyins as the unit (100% = +1 buyin) and EV is typically $ as the unit. Obviously they're not the same when they have different units, so saying that a $10k buyin has a bigger EV beccause you win more money, Meh, it's borderlin true.