Spline interpolation for demographic variables: The monotonicity problem
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In demography, it is often necessary to obtain a monotonic interpolation of data. A solution to this problem is available using the Hyman filter for cubic splines. However, this does not seem to be well known amongst demographers, and no implementation of the procedure is readily available. We remedy these problems by outlining the relevant ideas here, and providing a function for the R language.
Keywordsinterpolation splines monotonic age groups age distribution deaths data bank
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