subset.ts {forecast}R Documentation

Subsetting a time series

Description

Extracts the values of a specific season or subset of seasons in each year. For example, to extract all values for the month of May from a time series.

Usage

## S3 method for class 'ts'
subset(x, subset=NULL, month=NULL, quarter=NULL, season=NULL, ...)

Arguments

x

a univariate time series to be subsetted

subset

optional logical expression indicating elements to keep; missing values are taken as false. subset must be the same length as x.

month

Numeric or character vector of months to retain. Partial matching on month names used.

quarter

Numeric or character vector of quarters to retain.

season

Numeric vector of seasons to retain.

...

Other arguments, unused.

Details

If character values for months are used, either upper or lower case may be used, and partial unambiguous names are acceptable. Possible character values for quarters are "Q1", "Q2", "Q3", and "Q4".

Value

If subset is used, a numeric vector is returned with no ts attributes. Otherwise, a ts object is returned with frequency equal to the length of month, quarter or season.

Author(s)

Rob J Hyndman

See Also

subset

Examples

plot(subset(gas,month="November"))
subset(woolyrnq,quarter=3)

[Package forecast version 7.1 Index]