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Curve Fitting

Age profiles published in statistical year books are ususually for five-year age groups. Sometimes the age interval varies within the series. The mean values for each age group will depend on the age distribution of the population within the age group. The upper, open-ended age group may be particularly influenced by the age distribution, especially if the age interval is large. The attached document describes a method and includes stata files for fitting a curve to grouped data. The example is per capita health expenditure in Japan.

curve fitting