Compute the age in years of an individual based on the birth date and another date
1  age(from, to)

from 
a vector of dates (birth dates) 
to 
a vector of current dates 
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.
A vector of ages (in years)
Claus Ekstrom claus@rprimer.dk
as.POSIXlt
1 2 3 
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