Compute the age in years of an individual based on the birth date and another date
Usage
age(from, to)
Arguments
from
a vector of dates (birth dates)
to
a vector of current dates
Value
A vector of ages (in years)
Details
For linear interpolation the auc function computes the area under the curve
using the composite trapezoid rule. For area under a spline interpolation,
auc uses the splinefun function in combination with the integrate to
calculate a numerical integral. The auc function can handle unsorted time
values, missing observations, ties for the time values, and integrating over
part of the area or even outside the area.