year {biostat3}

R Documentation

Convert a Date vector to a numeric vector

Description

Convert a Date vector to a numeric vector (either continuous or truncated).

Usage

year(date, trunc = FALSE, year.length = 365.24)

Arguments

date	Date vector
trunc	logical for whether to truncate the date to a whole year or consider the date as a double (default).
year.length	assumed length of a year

Details

For the double calculation, we use (truncated year of Date) + (date - 1 Jan of Year)/year.length.

Value

numeric vector

Examples

  c(year(as.Date("2001-07-01")),year(as.Date("2001-01-01"),trunc=TRUE))

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