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stampStamp Thickness Dataset stamp
Usage:

data(stamp)
Format:

Data frame with thick (stamp thickness) and count (number of stamps) variables.
Description:

Thicknesses of 482 postage stamps of the 1872 Hidalgo issue of Mexico.
Source:

Izenman and Sommer (1988).
References:

Izenman, A. J. and Sommer, C. J. (1988). Philatelic mixtures and multimodal densities. Journal of the American Statistical Association 73, 602-606.
Key Words:

datasets