10th November 2012, 01:58 PM
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Member
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Join Date: Dec 2011
Posts: 334
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Quote:
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Originally Posted by UselessBettor
I think you need to use the chi test but it is suseptible to back fitting. The bell curve analysis ensures that there are enough results tested. If the bell curve is smooth then you should be right. If its jagged or has no shape you are likely to have backfitted results.
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Yes, that's the approach I used as well UB, using the Bell Curve confirm Chi-test results to satisfy myself I hadn't back-fitted, however I found that depending on grouping size the bell curve could vary wildly, & that was with large sample sizes (>5000 races, grouping sizes from 25 to 50), so I lost confidence in it.
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