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[QUOTE="IADaveMark, post: 6361135, member: 490208"]
Part of it is likely [URL="https://en.wikipedia.org/wiki/Simpson%27s_paradox"]Simpson's Paradox[/URL] but the rest of it may very well be because of how they are determining "average ROI". If they are taking the ROI from each individual session and averaging [I]those [/I]values, it may not line up with doing an ROI calc from the sum of all results.

For example, let's say we played 9 $1 tournaments and won $2 on each. The ROI for each of those is 100%. So we have 9x 100% ROIs. Then we play a $100 tournament and do not cash. Therefore, our ROI for that one is 0%.

This gives us 9x 100% and 1x 0%. The average ROI [I]per tournament [/I]is 90%!!

However, we wagered $109 total and only made that $1 9 times... or $9. That gives us an ROI of about 8% [I]when taken as a total.[/I] Yeah, we have an ROI of 8%, but we lost $100.

Note the difference between those two:
Case 1: 100% ROI, losing $100
Case 2: 8% ROI, losing $100

You can do the same thing with the "average profit". We lost $100 over 10 games, so our "average profit" is -$10 either way. "But how can we average losing $10/game when we most of the time played for $1?!?" Because that's how averages work on raw numbers.

So the problem is that they are doing "average profit" by taking total/total but average ROI by doing it session/session.
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