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<p>[QUOTE=&quot;dd27, post: 2622592, member: 80416&quot;]I searched the PCGS website regarding Ron Guth&#039;s 80% accuracy figure, but I did not find anything. I used both the PCGS internal search function, and using:</p><p><br /></p><blockquote><p>site:<a href="http://www.pcgs.com" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.pcgs.com" rel="nofollow">http://www.pcgs.com</a> &quot;80% accurate&quot;</p><p>site:<a href="http://www.pcgs.com" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.pcgs.com" rel="nofollow">http://www.pcgs.com</a> accurate</p><p>site:<a href="http://www.pcgs.com" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.pcgs.com" rel="nofollow">http://www.pcgs.com</a> accuracy</p></blockquote><p><br /></p><p>I submitted a question to PCGS asking if &quot;80% accuracy&quot; is based on a formal inter-rater reliability study or not.</p><p><br /></p><p>The exact quote from the video is:</p><p><br /></p><blockquote><p>...&quot;and even then there are differences in grading. What we&#039;ve learned is that the best graders get it right about 80% of the time. But when you go from grader to grader to grader, statistically they all sort of even out.&quot; -&nbsp; former PCGS President Ron Guth</p><p><br /></p><p>CoinWeek: We Take the PCGS Grading Challenge!</p><p>[MEDIA=youtube]cuSk3Mrb1uA[/MEDIA]</p></blockquote><p><br /></p><p>---</p><p><br /></p><p>The PCGS grading process is explained in this 2007 video on YouTube: <a href="https://youtu.be/hAQv6qmGcis" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://youtu.be/hAQv6qmGcis" rel="nofollow">PCGS Grading Process Video</a></p><p><br /></p><p>And this quote is from the PCGS website, on the <a href="http://www.pcgs.com/faq" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.pcgs.com/faq" rel="nofollow">FAQ page</a>:</p><p><br /></p><p>&quot;Every coin submitted to PCGS for grading is reviewed by a minimum of two and in most instances three or more of our grading experts.&quot; - PCGS.com/FAQ/<a href="http://www.pcgs.com/faq#45" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.pcgs.com/faq#45" rel="nofollow">Miscellaneous</a>/<i>How many PCGS experts (graders) review my submission?</i>[/QUOTE]</p><p><br /></p>

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