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<p>[QUOTE=&quot;quarter-back, post: 1929162, member: 47022&quot;]I don&#039;t think that copper hoarders would affect the outcome much since they would be pulling coins without regard to the date.&nbsp; I would expect hoarding to increase the attrition rate for all years equally, but not change attrition rates relative to each other. I only used mintages between 1959 and 1982 to determine the proportions, so aside from the small percentage of zinc cents in 1982, zinc coins (everything after 1982) were not included in the calculations.&nbsp; As such, these data likely primarily reflect attrition rates that span the twenty years or so before copper hoarding became popular</p><p><br /></p><p>I guess its possible that collectors could be withdrawing early memorials at a higher rate then later ones.&nbsp; I can think of a couple of possibilities (1959 first year coins, and 60 large and small date coins). I think I can pull that type of effect out of the data by seeing if there is a significant increase in attrition for those dates. But now we get into the question of exactly how much impact do collectors have on attrition.&nbsp; I think that question either was pretty much answered in the mid-60&#039;s or we will soon will be seeing the elimination of mintmarks.</p><p><br /></p><p>I have graphed the data (told you I am a geek) and will post it later[/QUOTE]</p><p><br /></p>

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