Calculates age in years based on a reference date, which is the sytem date at default.
date(s), will be coerced with
reference date(s) (defaults to today), will be coerced with
Integer (no decimals)
On our website https://msberends.gitlab.io/AMR you can find a comprehensive tutorial about how to conduct AMR analysis, the complete documentation of all functions (which reads a lot easier than here in R) and an example analysis using WHONET data.
age_groups to split age into age groups
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