As many of you know, Q. David Bowers has been tackling the gradeflation problem frequently in Coin World columns: Examining inflation of grading:...
No answer yet from PCGS, but let me explain why a formal inter-rater reliability study is important. First one needs to determine what one means...
And then there is today's shot across the bow by NGC, discussed on the forum here: Holy .... NGC just took PCGS behind the woodshed! ... and...
Yes, that is the only definitive way to resolve the question. That is indeed the $64,000 question. Or should I say the $640,000 question......
I searched the PCGS website regarding Ron Guth's 80% accuracy figure, but I did not find anything. I used both the PCGS internal search function,...
Thank you both for the info! :) Naturally, I am now wondering how they arrived at this 80% accuracy figure. If anyone knows, please share. In the...
How do we know that TPG graders are accurate 80% of the time? Or, was that simply a hypothetical number for purposes of discussion? TIA, Mark
I did not know that professional graders must grade so many coins in a day. That fact alone made David's post valuable, although he offered...
Ah, excellent point. Thanks! :happy:
The link is still in the following post by OldDan. If you hover your mouse over it to see the link, it does have an underscore instead of a...
I was trying to learn more about reprocessed 1943 cents and discovered this (very helpful) thread. Please note that the link in the post by...
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