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Old 01-02-2017, 06:39 AM  
Barry-xlovecam
It's 42
 
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Join Date: Jun 2010
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Posts: 18,083
Either that ^^^ or if you have a large sample over a pool of sponsors
https://en.wikipedia.org/wiki/Deviat...te_deviat ion

Try statistical deviation.
However, you would need a large pool of overall data for an industry -- that is known true data.

If you ask every sponsor what their rebill rate is they would just fabricate a number -- unreliable data.

Last rebill rate I recall quoted by a neutral source was years ago and it was 1.7 -- he was making the case for PPS -- so it may have been biased.
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