TSA (version 1.01)

season: Extract the season info from a time series

Description

Extract the season info from a equally spaced time series and create a vector of the season info. For example for monthly data, the function outputs a vector containing the months of the data.

Usage

season(x, labels)

Arguments

x

a time series

labels

the user supplied labels for the seasons

Value

An invisible vector containing the seasons of the data

Details

The time series must have frequency greater than 1, otherwise the function will stop and issue an error message. If labels is missing, labels will be set as follows: It is set to be c("1Q","2Q","3Q","4Q) if the frequency of x equals 4, c("January",...,"December") if the frequency equals 12, and c("Monday",...,"Sunday") if frequency equals 7. Otherwise, it is set to be c("S1",...)

See Also

harmonic

Examples

# NOT RUN {
data(tempdub)
month.=season(tempdub) # the period sign is included to make the printout from
# the commands two line below clearer; ditto below.
model2=lm(tempdub~month.-1) # -1 removes the intercept term 
summary(model2)
# }