Chap10A - at...

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at , Dickerson and Johnson (1999)). Since age is related to many variates and variables studied by economists, epidemiologists, demographers, and other health scientists, population pyramids cast their shadows on almost all curves encountered in studies that involve natural populations of human beings or animals. For this reason, rough-edged densities encountered by applied statisticians are rarely just artifacts to be explained by the catch-all term "sampling variation." Instead, these edges are natural features that cannot be smoothed away. Again, as in the case of bathtub functions, f -type curves with rough edges differ substantially from Normal densities. The curse of dimensionality is encountered so often in close proximity to population pyramids a warning is in order. In the many circumstances where the outlines of marginal densities of single demographic and vital statistics variates are roughened by the influence of age-distribution irregularities, the
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This note was uploaded on 02/04/2011 for the course PB HLTH 140 taught by Professor Tarter during the Fall '10 term at University of California, Berkeley.

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Chap10A - at...

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