jumps (version 1.0)

auto_hpfj_fix: Automatic selection of the optimal HP filter with jumps and fixed smoothing constant

Description

The regularization constant for the HP filter with jumps is the maximal sum of standard deviations for the level disturbance. This value has to be passed to the hpfj_fix function. The function auto_hpfj_fix runs hpfj_fix on a grid of regularization constants and returns the output of hpfj_fix according to the chosen information criterion.

Usage

auto_hpfj_fix(
  y,
  lambda,
  grid = seq(0, sd(y) * 10, sd(y)/10),
  ic = c("bic", "hq", "aic", "aicc"),
  edf = TRUE
)

Value

The ouput of the hpjf function corresponding to the best choice according to the selected information criterion.

Arguments

y

numeric vector cotaining the time series;

lambda

smoothing constant;

grid

numeric vector containing the grid for the argument maxsum of the hpfj function;

ic

string with information criterion for the choice: the default is "bic" (simulations show this is the best choice), but also "hq", "aic" and "aicc" are available;

edf

logical scalar: TRUE (default) if the number of degrees of freedom should be computed as "effective degrees of freedom" (Efron, 1986) as opposed to a more traditional way (although not supported by theory) when FALSE.

Examples

mod <- auto_hpfj_fix(Nile, "annual")
plot(as.numeric(Nile))
lines(mod$smoothed_level)