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Supplement to: “Mortality and life expectancy forecasting for a group of populations in developed countries: A multilevel functional data method.” by H. L. Shang. This supplement contains a PDF divided into four sections. Supplement A: Some theoretical properties of multilevel functional principal component decomposition; Supplement B: Derivation of posterior density of principal component scores and other variance parameters; Supplement C: WinBUGS computational code used for sampling principal component scores and estimating variance parameters from full conditional densities; Supplement D: Additional results for point and interval forecast accuracy of mortality and life expectancy, based on maximum forecast error measures.