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US Coins Forum This forum dedicated to the discussion of United States Coins.

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Old 07-28-2008, 11:07 AM   #91 (permalink)
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hi Charlie,,,I read your message about you sayin ANACS-SLAB HOLDERS, are easy to open up, without anyone knowing? I thought all Grading-Service Slab holders had it to where, to would be almost impossible to Crack-Open,,, without showing some kind of force , or markings,,,,,how are these Grading Services slabbing for security measures, anyway,,,,,Maybe Anacs ' needs to use a heavy-dose of (Super-Glue) so no dishonest or otherwise can open them ... If anyone knows about this, please post ,thanks so much ! In Adv/ chasindreams

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Old 07-28-2008, 06:34 PM   #92 (permalink)
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MIdas, I looked at the Heritage numbers that you posted earlier and did a little statistical analysis....

Anyway, For NGC 65 coins the average price was $78.78 with a standard deviation of $5.08.

For PCGS 65's the avearge was $97.11 with a standard deviation of $6.88.

That means that the PCGS 65 coins sell for an average of 23.28% more, but they have a standard deviation that is 35.5% more!
Thank you, Thank You, THANK YOU. This is exactly the sort of analysis that is needed.

One of the concerns I have about this particular set of numbers... it is for a Lincoln cent, which has the designation BN, RB, or RD in addition to the numerical grade. I don't see any correction for that, since Midas didn't include that detail in his stack of numbers.

That factor alone adds much to the standard deviation, since BN, RB, or RD sell for dramatically different prices.

Another MAJOR factor to watch for when using Heritage's history to look for price trends... since ANACS places problem coins in holders*, beware when you see an ANACS price half of the NGC price. It's not because ANACS sucks... it's because that ANACS coin was a problem coin. That fact is hidden when looking at the big stack of numbers.

That illustrates why NGC was wise to place problem coins in NCS holders... it distances the NGC name, brand perception, and value perception away from the lower value problem coins.


* plainly and clearly labeled as problem coins

Last edited by 900fine; 07-28-2008 at 06:43 PM.
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Old 07-28-2008, 06:40 PM   #93 (permalink)
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....if you had a 1913 V Nickel.....it won't matter who its graded by because they are going to sell for millions anyway.
...and there are plenty of fabulous rarities in NGC slabs. Look at the big Power Player auctions.

If NGC is inferior, why are the biggest entrusting their best to NGC as well as PCGS ?
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Old 07-28-2008, 06:55 PM   #94 (permalink)
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BTW, I disregarded the coins that you listed from Teletrade based on the very small (and statistically insignificant) sample sizes.
Again, THANK YOU.

The notion of small sample size, statistical irrelevance, and the tendency for anecdotal information to mislead is lost on many.

Some folks will compare five or six sales, looking at slab numbers only, and draw far-reaching conclusions. What might be happening in one time and place, and one series / denomination, is not to be wildly extrapolated around the world.

Just because you think you have a correlation for Frankies doesn't mean it works for Chain cents !

What's more, most people buy the coin, not the slab. That's one reason there's so much standard deviation... not all MS63s are created equal ! Exceptional coins within a grade sell for more.
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