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<p>[QUOTE=&quot;kanga, post: 1845138, member: 9270&quot;]At one time I tried writing an algorithm that would interpolate the values of intermediate grades.</p><p>Basically taking CDN or CW values for a specific coin and calculating the values of grade not included in their charts such as MS-61 or MS-62.</p><p>Since the chart of the values from VG(-8) to MS-65 is not linear, strict averaging is not correct, i.e., the XF-45 value is <b>not</b> halfway between the XF-40 and AU-50 values.</p><p><br /></p><p>Each coin would have its own equation.</p><p>In theory I would put in the data points (value at each grade), hit ENTER and out would pop the coefficients for the equation (in my mind some sort of polynomial).</p><p>I also wanted to force the equation to go through all the data points.</p><p>Then I could select an &quot;in between&quot; grade and interpolate its value.</p><p><br /></p><p>I never did get it right.</p><p>I think was trying to use a math model and method that wasn&#039;t correct for the way I wanted it to operate.</p><p><br /></p><p>Okay, did I glaze over everyone&#039;s eyes?</p><p>Sorry about that.[/QUOTE]</p><p><br /></p>

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