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<p>[QUOTE="cladking, post: 1466500, member: 68"]ATT DSL service is so bad I can't even watch the uTube.</p><p><br /></p><p>Actually it's pretty easy to develop the equations to do what you want but you're shooting yourself in the feet before you start. You need data and you're throwing most of it away by not counting the later issues. There are confounding factors and I'm not going to get into them here but you just need to make the assumption that the attrition rate on all coins is the same year in and year out. </p><p><br /></p><p>If you do this you'll find about 55% of 1965 dimes are gone now and about 40% of 1965 nickels (quarters are getting close to 50%). If you live on either coast you'll need to throw out the outliers in the past ten years for dimes and 20 years for nickels because of their low velocity. </p><p><br /></p><p>The assumption that the attrition rate on the pre-1965 coinage is constant is a poor one because collectors selectively save these. You can't get an accurate rate on these because there are millions in collections and hoards. Hoards eventually get respent especially during economic downturns so the incidence of old nickels and silver dimes is inversely correlated to the health of the economy.[/QUOTE]</p><p><br /></p>
[QUOTE="cladking, post: 1466500, member: 68"]ATT DSL service is so bad I can't even watch the uTube. Actually it's pretty easy to develop the equations to do what you want but you're shooting yourself in the feet before you start. You need data and you're throwing most of it away by not counting the later issues. There are confounding factors and I'm not going to get into them here but you just need to make the assumption that the attrition rate on all coins is the same year in and year out. If you do this you'll find about 55% of 1965 dimes are gone now and about 40% of 1965 nickels (quarters are getting close to 50%). If you live on either coast you'll need to throw out the outliers in the past ten years for dimes and 20 years for nickels because of their low velocity. The assumption that the attrition rate on the pre-1965 coinage is constant is a poor one because collectors selectively save these. You can't get an accurate rate on these because there are millions in collections and hoards. Hoards eventually get respent especially during economic downturns so the incidence of old nickels and silver dimes is inversely correlated to the health of the economy.[/QUOTE]
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