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<p>[QUOTE=&quot;mrbrklyn, post: 445104, member: 4381&quot;]Oh without a doubt, the hole grading system is flawed.&nbsp; Not because it isn&#039;t perfect, but because don&#039;t know how imperfect it is and more importantly, how consistent it is.&nbsp; A professional in this field of industrial mock ups etc and improve the consistency and the quality of the grading, strangly enough, even if the individual graders are less accurate.</p><p><br /></p><p><br /></p><p>The problem is that the real, not market, but physical difference between a 69 and 70 is much smaller than other grades....and it is the end.&nbsp; You can&#039;t get better than 70 and therefor, not that is matters at this point, you can&#039;t use a standard bell curve for the analysis.&nbsp; You have to use something called Rho Chi methodology.&nbsp; It is the statistical model for systems that have variability but have a solid limit and is missing a degree of freedom which can&#039;t be passed.&nbsp; Examples would include the ERA in baseball, it can&#039;t be less than zero and the closer to zero you get the hard it is to reduce.&nbsp; There are other examples but they are more exotic.</p><p><br /></p><p>Ruben[/QUOTE]</p><p><br /></p>

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