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<p>[QUOTE="messydesk, post: 3627679, member: 1765"]A typical grading event is a coin that is graded more or less correctly. If there is a 50% chance that a group of 25 randomly selected coins will have one that is way off, then there is a 2.7% chance of an atypical grading event for any given coin.</p><p><br /></p><p>For this study, we're going by photos, so we have an incomplete picture. If Jason grabs a random coin and sees that it doesn't make any sense, he won't know if that's on Heritage photo people, the TPG graders, or a "mechanical error." What's to gain by introducing it into the study? It would seem better (necessary, actually) to disclose the selection methodology, including reasons for excluding a coin and how many randomly selected coins were rejected.[/QUOTE]</p><p><br /></p>
[QUOTE="messydesk, post: 3627679, member: 1765"]A typical grading event is a coin that is graded more or less correctly. If there is a 50% chance that a group of 25 randomly selected coins will have one that is way off, then there is a 2.7% chance of an atypical grading event for any given coin. For this study, we're going by photos, so we have an incomplete picture. If Jason grabs a random coin and sees that it doesn't make any sense, he won't know if that's on Heritage photo people, the TPG graders, or a "mechanical error." What's to gain by introducing it into the study? It would seem better (necessary, actually) to disclose the selection methodology, including reasons for excluding a coin and how many randomly selected coins were rejected.[/QUOTE]
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