TPG Research Discovery - Page 2 - Coin Community Forum

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Author	Replies: 19 / Views: 3,176	Page: of 2

basebal21 Bedrock of the Community 13014 Posts	Posted 12/29/2018 10:44 pm Quote: In most cases, PCGS awarded a higher proportion of top grades: This is a completely flawed research method here and in this case I will say it holds absolutely no value at all. PCGS does get a higher percentage of the best US coins so they should have a higher percentage of the better grades. Even if we completely ignore that, we can't tell me how many of those coins in those populations are unique. Several of those have the same coin counted multiple times, they also have NGC coins that were crossed over to PCGS so the same coin is counted in both. It has to be a truly rare thing like 1804 dollars to be sure the population reports are 100 percent accurate, even in those cases there's times things have been double counted from upgrade attempts or cross overs There's no way to take percentages when it is impossible to weed out everything that's been counted multiple times Edited by basebal21 12/29/2018 10:56 pm Report this Post to the Staff
Coinaholic20 New Member Australia 17 Posts	Posted 12/30/2018 05:23 am Browsing on ebay can be so entertaining haha Report this Post to the Staff
tdziemia Pillar of the Community United States 7940 Posts	Posted 12/30/2018 11:53 am @basebal21, I agree with your comments on my post. I'm guilty of sloppy wording, and should have just said we "find a higher proportion of top grades in the population report..." The purpose of that exercise was just to show that even if we use the method used by the OP on the 1948 Franklin half, we do NOT necessarily find that NGC tends to have more top graded coins than PCGS. Report this Post to the Staff
basebal21 Bedrock of the Community 13014 Posts	Posted 01/01/2019 01:50 am Quote: @basebal21, I agree with your comments on my post. I'm guilty of sloppy wording, and should have just said we "find a higher proportion of top grades in the population report..." The purpose of that exercise was just to show that even if we use the method used by the OP on the 1948 Franklin half, we do NOT necessarily find that NGC tends to have more top graded coins than PCGS. But that was the point, the population reports except in the instances of extreme rarities are pretty worthless for trying to do mathematical analysis. They're good for finding where grades get scare or what issues should be harder to find, but they are far too inaccurate for statistical analysis which I know a lot of people would like to see. The point I was and have been making is that there's so much more that goes into this. Anyway, try out those theories sometime might be eye opening Report this Post to the Staff
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