Periodic dummies and contrasts

Usage

periodic.dummies(frequency, start, length, s)

periodic.contrasts(frequency, start, length, s)

Arguments

frequency: Frequency of the series, number of periods per year (12,4,3,2..)
start, length: First date (array with the first year and the first period) (for instance c(1980, 1)) and number of periods of the output variables. Can also be provided with the s argument
s: time series used to get the dates for the trading days variables. If supplied the parameters frequency, start and length are ignored.

Details

The function periodic.dummies creates as many time series as types of periods in a year (4 or 12) with the value one only for one given type of period (ex Q1) The function periodic.contrasts is based on periodic.dummies but adds -1 to the period preeceding a 1.

Examples

# periodic dummies for a quarterly series
p<-periodic.dummies(4, c(2000,1), 60)
#periodic contrasts for a quarterly series
q<-periodic.contrasts(4, c(2000,1), 60)
q[1:9,]
#>       Series 1 Series 2 Series 3
#>  [1,]        1        0        0
#>  [2,]        0        1        0
#>  [3,]        0        0        1
#>  [4,]       -1       -1       -1
#>  [5,]        1        0        0
#>  [6,]        0        1        0
#>  [7,]        0        0        1
#>  [8,]       -1       -1       -1
#>  [9,]        1        0        0