notes Period life table construction

notes Period life table construction - Eco 572 Research...

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Eco 572: Research methods in Demography Period Life Table Construction Here's how to reproduce the calculations in Box 3.1 of Preston et a. (p. 49) using Stata as a calculator. (Stata has a ltable command for cohort life tables.) The input data are counts of the mid-year population and the number of deaths at ages 0,1-4,5-9,...,80-84,85+ for Austrian males in 1992, available in the course website. . infile age N D using (19 observations read) We need the width of the age intervals. . gen n = age[_n+1]-age // leaves width of last interval missing (1 missing value generated) The calculations are pretty straitforward. The numbers below refer to the numbered steps in the textbook. To ensure full precision I use doubles; floats are good for only about 7 digits and this can be a problem with large numbers such as n L x . 1. We compute death rates dividing events by exposure. . gen m = D/N 2. Next we need the time lived by deaths ( n a x ). Preston et al. borrow these values for ages 5 to 75 from Keyfitz and Flieger (1971), p.21. I saved those values in a Stata file so I can easily merge them here (after sorting by age) . sort age . merge age using
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