10th November 2012, 12:43 PM
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Member
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Join Date: Sep 2011
Posts: 1,474
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Quote:
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Originally Posted by norisk
Good post UB.
I used to be a big believer in Bell Curves, but thanks to advice from iirc Angry Pixie & other reading etc, not so much these days - provided the chi-test looks ok with a good sized sample that's probably good enough.
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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. |