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

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