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You cannot calculate your true ROI.

Given a significant number of STTs your numbers take on some sort of meaning given certain confidence intervals and whatnot....

Temporally, there are too many factors IMO to have any sort of good 'rule of thumb' for how ROI is being impacted by outside factors.

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So regardless of you past history, there is no true ROI for the future? And yes, your probably right about me being to vested in my results. I imagine that I should just focus on plugging leaks than results. Thanks for the help.