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<p>[QUOTE=&quot;quarter-back, post: 1929236, member: 47022&quot;]I don&#039;t think sampling bias caused the discrepancy.&nbsp; If that were case, I would expect the observed ratio to track the expected ratio.&nbsp; The fact that the observed line is nearly flat suggests that the ratio of mintmarked coins is pretty constant regardless of the numbers minted in the various years.&nbsp; That being said, I am in an area that is served by the Denver mint.&nbsp; I rarely see a new Philadelphia coin.&nbsp; So I can&#039;t completely discount sampling bias.[/QUOTE]</p><p><br /></p>

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