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<p>[QUOTE=&quot;messydesk, post: 3652605, member: 1765&quot;]We&#039;re four coins into this experiment.&nbsp; If people use each coin as an opportunity to learn just a little more about how to use Heritage&#039;s pictures to grade coins, then we should see the mean of our grades come closer to the PCGS grade, and the standard deviation also come down.</p><p><br /></p><p>The AU58 grade is a pesky grade from the standpoint of rating our grading.&nbsp; Arguably, 58 is a nicer coin than 61, and maybe even 62, so perhaps it should go there for the purposes of computing our stats.&nbsp; As I illustrated elsewhere, this does affect the scores somewhat, but it&#039;s probably not necessary to do this.&nbsp; The presentation of our accuracy at the end of the experiment along with an explanation of how AU58 tends to work should be sufficient to show that it can be difficult to tell AU58 from a nice uncirculated coin from a Heritage picture alone.&nbsp; This is something we should already know.&nbsp; We may also discover whether or not we get better at telling AU58 from MSsomething using Heritage pictures, but there may not be enough coins in the study to really show this.[/QUOTE]</p><p><br /></p>

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