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Re: good sample size for ROI calculation
Hi Paul,
interesting Post, but can you tell us where the 180% come from? It seems to me, your Formula doesn't agree with 2+2 spreadsheet: I have measured a ROI of +20.1% over 428 Tourneys. So by your Formula my SD should be 9% and I could be sure to be a winnign player at the 95% confidence Level, but not at the 99%, am I right? But the spreadsheet tells me, my "Winning Confidence" is 99.6% and I can have a 99% confidence that my $/tourney is between 0.03$ and 2.17$ (5+05$ Tourneys). So, according to you my winning Confidence is between 95% and 99%, but according to the spreadsheet it is over 99%. Another Formula? And why, where does it come from? |
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