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<p>[QUOTE=&quot;The_Cave_Troll, post: 129246, member: 1674&quot;]MIdas,&nbsp; I looked at the Heritage numbers that you posted earlier and did a little statistical analysis.</p><p><br /></p><p>for the 09 VDB I threw out the MS 64 grades because there was only a handful, obviously there weren&#039;t enough to be statistically significant. and I threw out the 67&#039;s because those were all graded by PCGS, and that would have been a boring comparison.&nbsp; That brings up an interesting question though, why were there 10 PCGS 67&#039;s and NO NGC 67&#039;s?&nbsp; Is that a reflection on how often those companies give out 67&#039;s or does it mean something else?&nbsp; I don&#039;t know.</p><p><br /></p><p>Anyway, For NGC 65 coins the average price was $78.78 with a standard deviation of $5.08.</p><p>For PCGS 65&#039;s the avearge was $97.11 with a standard deviation of $6.88.</p><p><br /></p><p>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!</p><p><br /></p><p>Nor the NGC 66&#039;s the average sale price was $166.75 with a standard deviation of $14.08, while the PCGS 66&#039;s sold for an average of $204.70 with a standard deviation of $20.12.</p><p><br /></p><p>Again PCGS sold for more (on average 22.76% more) but had a standard deviation that was 42.83% higher!</p><p><br /></p><p>Now for the 81S Morgans.</p><p><br /></p><p>First I disregarded the ANACS coins because of the small sample size and the fact that no one is disputing the fact that NGC and PCGS are the top 2 companies.</p><p><br /></p><p>The NGC graded coins sold for an average of $151.24 with a standard deviation of $40.57 and the PCGS 65&#039;s sold for an average of $157.15 with a standard deviation of $57.38.</p><p><br /></p><p>Once again the PCGS coins sold for more (on average 3.91% more) but this time the standard deviation of the PCGS sample was 41.43% greater on average!</p><p><br /></p><p>What these numbers tell me is what we&#039;ve been hearing all along, PCGS coins sell for more (sometimes a tiny bit more as in the1881 S dollar), but based on the differences in standard deviations, the PCGS graders aren&#039;t as consistant as their NGC counterparts.&nbsp; The prices of NGC coins are just much more stable than the prices of PCGS coins.&nbsp; BOCTAOE</p><p><br /></p><p><br /></p><p>BTW, I disregarded the coins that you listed from Teletrade based on the very small (and statistically insignificant) sample sizes.[/QUOTE]</p><p><br /></p>

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