add_seasonal: Seasonal Trend Component

In tsaux: Time Series Forecasting Auxiliary Functions

Seasonal Trend Component

Description

Seasonal Trend Component

Usage

## S3 method for class 'issm.component'
add_seasonal(
  object,
  frequency = 12,
  gamma = 0.01,
  s0 = NULL,
  init_harmonics = frequency/2,
  normalized_seasonality = TRUE,
  init_scale = 1,
  ...
)

Arguments

object	an object of class issm.component or other supported class.
frequency	seasonal frequency.
gamma	the decay coefficient on the error of the seasonal component
s0	a vector of length frequency - 1 for the initial seasonal component.
init_harmonics	number of harmonics to initialize s0 when this is not provided.
normalized_seasonality	whether normalize the seasonal component based on the method of Roberts and McKenzie. This is applied only to a single seasonal frequency.
init_scale	the scaling multiplier for s0 (when this is not provided).
...	additional parameters.

Value

An object of class issm.component updated with the seasonal component.

tsaux documentation built on April 4, 2026, 9:06 a.m.