Journal of Population Research (2004), 21(1), 95-98.
Len Smith1, Rob J. Hyndman2 and Simon N. Wood3
- Australian Centre for Population Research, Australian National University, ACT 0200, Australia.
- Department of Econometrics and Business Statistics, Monash University, VIC 3800, Australia.
- Department of Statistics, The University of Glasgow, Glasgow G12 8QQ, U. K.
Abstract: 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 package.