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<p>[QUOTE=&quot;mrbrklyn, post: 447340, member: 4381&quot;]The problem here is that it would take more than a few example coins to show a 70 grade.&nbsp; You would need to examine the grading system for its ability to consistently prevent false positives. false negatives, as well as correct grades which they hold to be a 70 grade.</p><p><br /></p><p>In other words, after a test run of a valid number of samples, run repeated through the grading process, probably for each coin that they grade, you would have to see how many 69 grades which were actually 70&#039;s were produced (false negitives).&nbsp; How many 70 grades were actually 69 (false positives), and how many 70&#039;s were actually caught and graded correctly.&nbsp; </p><p><br /></p><p>This is a more complex analysis then it even looks because you don&#039;t have a standard measurement to go by (YET - but computer grading is probably coming).&nbsp; That means that through the use of statistics, these numbers have to estimated by the results of the graders to repeat outcomes.&nbsp; And then an analysis of deviations.</p><p><br /></p><p>Ruben[/QUOTE]</p><p><br /></p>

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