R: Forecast seasonal index

sindexf {forecast} | R Documentation

## Forecast seasonal index

### Description

Returns vector containing the seasonal index for `h` future periods. If the seasonal index is non-periodic, it uses the last values of the index.

### Usage

    sindexf(object, h)

### Arguments

`object` | Output from `decompose` or stl.
`h` | Number of periods ahead to forecast

### Value

Time series

### Author(s)

Rob J Hyndman

### Examples

    uk.stl <- stl(UKDriverDeaths,"periodic")
    uk.sa <- seasadj(uk.stl)
    uk.fcast <- holt(uk.sa,36)
    seasf <- sindexf(uk.stl,36)
    uk.fcast$mean <- uk.fcast$mean + seasf
    uk.fcast$lower <- uk.fcast$lower + cbind(seasf,seasf)
    uk.fcast$upper <- uk.fcast$upper + cbind(seasf,seasf)
    uk.fcast$x <- UKDriverDeaths
    plot(uk.fcast,main="Forecasts from Holt's method with seasonal adjustment")

[Package forecast version 8.12 Index]