yrfraction: Fraction of the year

In season: Seasonal analysis of health data

Description

Calculate the fraction of the year for a date variable (after accounting for leap years) or for month.

Usage

yrfraction(date, type='daily')

Arguments

date	a date variable if type=‘daily’, or an integer between 1 and 12 if type=‘monthly’.
type	‘daily’ for dates, or ‘monthly’ for months.

Details

Returns the fraction of the year in the range [0,1).

Value

yrfrac

Fraction of the year.

Author(s)

Adrian Barnett a.barnett<at>qut.edu.au

Examples

# create fractions for the start, middle and end of the year
date = as.Date(c(0,181,364), origin='1991-01-01')
# create fractions based on these dates
yrfraction(date)
yrfraction(1:12, type='monthly')

Example output

Loading required package: ggplot2
Loading required package: MASS
Loading required package: survival
[1] 0.0000000 0.4958904 0.9972603
 [1] 0.00000000 0.08333333 0.16666667 0.25000000 0.33333333 0.41666667
 [7] 0.50000000 0.58333333 0.66666667 0.75000000 0.83333333 0.91666667

season documentation built on May 2, 2019, 5:22 p.m.