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Message:: [QUOTE="physics-fan3.14, post: 4119463, member: 19165"]The TPG is the reference grade. It's the standard, and I'm judging CT's accuracy compared to the TPG. As you know, the TPGs have a wide variance. There are some barely-there 65's which should probably be a 64+, there are some really nice 65's which might be borderline 66. I am only choosing coins which I think are properly graded at the TPG grade. I know you've mentioned the semantics of these threads before - but in my opinion, these threads could be viewed either way. "Select the grade you think the coin should be" and "Select the grade the TPG assigned the coin" are different statements. I agree. However, I am intentionally selecting coins which I think are accurately graded. In this case, the two statements should be equivalent. Many threads are based on pointing out this difference - someone posts an undergraded or overgraded coin, with the intent of pointing out the TPG's error. That's not the goal here. Perhaps this introduces some bias into the results. I acknowledge this. However, I don't think it is significant enough to worry about, especially when I have guesses from 55 - 63 for the same coin, or an even wider range of 58-67 on the Liberty nickel in the other live thread.[/QUOTE]