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<p>[QUOTE="Roerbakmix, post: 3920889, member: 100731"]First, I can see and appreciate the tremendous amount of work that must have gotten into writing it. The lay out is clear, and the aim of the book is clear as well.</p><p>I note that you did not ask for feedback in your post - yet posting something as intriguing (and probably also triggering for some) as this will yield reactions.</p><p>My main concerns are already written above (i.e. ancient coins are difficult to grade and inter-observer variance is probably a big issue, historical prices are usually easy to find, the relation between grade and selling price is not well established, etc).</p><p><br /></p><p>On the last point (the relation between grade and price): I've done some research on predicting the selling price of some types of coin (I tried the Julius Caesar elephant denarius, Augustus comet denarius, Attica tetradrachm, and various others), only to find out that grade does not predict the selling price well, that is: it is probably largely unrelated to the actual selling price. To demonstrate this, lets take for example the Attica tetradrachm, using data from sixbid, n~1000</p><p>[ATTACH=full]1033564[/ATTACH]</p><p>where grade (range 0-5) roughly corresponds to no grade given (=0) to mint state (=5) - note that for grades 1-2 (good to fine), very few data points are available, resulting in uncertainty.[/QUOTE]</p><p><br /></p>
[QUOTE="Roerbakmix, post: 3920889, member: 100731"]First, I can see and appreciate the tremendous amount of work that must have gotten into writing it. The lay out is clear, and the aim of the book is clear as well. I note that you did not ask for feedback in your post - yet posting something as intriguing (and probably also triggering for some) as this will yield reactions. My main concerns are already written above (i.e. ancient coins are difficult to grade and inter-observer variance is probably a big issue, historical prices are usually easy to find, the relation between grade and selling price is not well established, etc). On the last point (the relation between grade and price): I've done some research on predicting the selling price of some types of coin (I tried the Julius Caesar elephant denarius, Augustus comet denarius, Attica tetradrachm, and various others), only to find out that grade does not predict the selling price well, that is: it is probably largely unrelated to the actual selling price. To demonstrate this, lets take for example the Attica tetradrachm, using data from sixbid, n~1000 [ATTACH=full]1033564[/ATTACH] where grade (range 0-5) roughly corresponds to no grade given (=0) to mint state (=5) - note that for grades 1-2 (good to fine), very few data points are available, resulting in uncertainty.[/QUOTE]
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