intervention function

Intervention analysis/Outlier treatment

intervention estimates the effect of a intervention at a known time.

## S3 method for class 'tfm'
intervention(
  mdl,
  y = NULL,
  type,
  time,
  n.ahead = 0,
  envir = parent.frame(),
  ...
)

intervention(mdl, ...)

## S3 method for class 'um'
intervention(
  mdl,
  y = NULL,
  type,
  time,
  n.ahead = 0,
  envir = parent.frame(),
  ...
)

Arguments

• mdl: an object of class um or tfm.
• y: a "ts" object, optional.
• type: the type intervention (pulse, step, ramp) or the type of outlier (AO, LS, TC, IO).
• time: the date of the intervention, in format c(year, season).
• n.ahead: a positive integer to extend the sample period of the intervention variable with n.ahead observations, which could be necessary to forecast the output.
• envir: the environment in which to look for the time series z when it is passed as a character string.
• ...: additional arguments.

Returns

an object of class "tfm" or a table.