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Mean Prices, by Year of Listing

The following graph shows the mean price (in US$) of all the items listed in each of the 22 volumes of the Antique Map Price Record.  The "error bars" depicted at the upper end of each bar enclose a confidence interval: You can be reasonable sure that the "real" mean, based on these data, falls somewhere between the upper and lower tails of the error bar. On the other hand, the AMPR data are heavily influenced by each year's choice of which catalogues are used, and the abnormally high means in 2006 and 2007 are probably due more to the inclusion of a number of very high-end catalogues (e.g. the Wardington sale) than to any real change in the market price for maps.

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