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<p>[QUOTE=&quot;Leadfoot, post: 1078495, member: 2972&quot;]I&#039;m not the one making the argument, you are.&nbsp; Therefore the burden of proof is on you.</p><p><br /></p><p>However, hoping to help, here&#039;s another suggestion -- try a certified coin (for instance include PCGS or NGC in your search term), actually look at the auctions you are including to be sure none are misrepresented, and include 25 examples of each coin.&nbsp; Something like &quot;1880-s PCGS MS65 Morgan&quot; would likely work -- but I think you should actually look at the auction listing to be sure no problem or raw coins are included in your sample set (i.e. don&#039;t make the same mistake again).</p><p><br /></p><p>I suspect, rather strongly, that your 20% will get much, much smaller.&nbsp; The remaining difference, if there is one, is likely attributed to one of the following:</p><p><br /></p><p>1) Trust in the seller/venue</p><p>2) Average quality of coin (i.e. better coins tend NOT to be sold on eBay).</p><p>3) Experience level of buyer (GDJMSP&#039;s point, which I believe is quite valid) and also the seller.</p><p>4) The ability to view the coins in-hand prior to bidding (HA and other auction houses provide this service, whereas eBay and TT wholly do not).</p><p>5) The price of a reserve.</p><p><br /></p><p>But please, re-run your queries and see what they say once you remove the skewed data from the eBay sample -- at least then we&#039;ll be arguing based on a fair comparison.</p><p><br /></p><p><br /></p><p><br /></p><p>No, I didn&#039;t miss that, and I am well aware of statistical analysis.&nbsp; More studied on the topic, I&#039;ll wager, than you.</p><p><br /></p><p>Regardless, it doesn&#039;t take a deep understanding of statistics to realize that you&#039;ve included problem and overgraded coins in your eBay auctions, when the frequency of these occurring in TT or HA is far lower, and thus skewing your answer in favor of lower prices on eBay.</p><p><br /></p><p>Said a bit more directly, what good is throwing out high and low, if throwing out the low still leaves cleaned and self/over-graded coins in the eBay sample?&nbsp; Not a bit of good if you ask me -- unless you&#039;re trying to make the point that you can buy coins on eBay for less. <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie2" alt=";)" unselectable="on" unselectable="on" /> </p><p><br /></p><p><br /></p><p><br /></p><p>What now?&nbsp; </p><p><br /></p><p>How about you <b>make an apples to apples comparison with a sample size large enough to draw conclusions that are statistically meaningful </b>rather than including data that skew your results and then cherry-picking one example that doesn&#039;t really prove anything.[/QUOTE]</p><p><br /></p>

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