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<p>[QUOTE=&quot;Publius2, post: 7492859, member: 105571&quot;]Pretty much every first-world business that makes widgets for civilian and military use employs Statistical Process Control to measure how well they meet their quality control criteria.&nbsp; I kinda doubt that the TPGs do this for counterfeits and altered genuine coins (AGCs) but they probably employ something like SPQ for regular grading.</p><p><br /></p><p>I would be interested in knowing what the raw numbers are for known counterfeits and AGCs for the four TPGs.&nbsp; I doubt there is a valid data base, but given the thousands of coins that go through their hands every week, I would surmise the counterfeits and AGCs they miss are statistically miniscule. </p><p><br /></p><p>Even if we limited the dataset to those coins minted before, say 1850, the error rate still is probably very small.</p><p><br /></p><p>We just have no way to rationally judge how well they are doing.&nbsp; Anecdotes won&#039;t cut it for me.</p><p><br /></p><p>That said, I applaud and support the efforts to make the TPGs better.[/QUOTE]</p><p><br /></p>

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