Forecast seasonal index

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 stats::decompose() or stats::stl().

h

Number of periods ahead to forecast.

Value

Time series

Author

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")