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mixAR (version 0.22.8)

raghat1: Filter a time series with options to shift and scale

Description

Filter a time series with options to shift and scale. This function is used by mixFilter.

Usage

raghat1(filter, x, index, shift = 0, residual = FALSE, scale = 1)

Value

A numeric vector of length equal to length(index).

Arguments

filter

The coefficients of the filter, numeric, see Details.

x

time series, numeric.

index

indices for which to compute the filtered values, numeric.

shift

a constant to be added to each filtered element, a number.

residual

if TRUE calculate a `residual', otherwise calculate a `hat' value.

scale

if scale != 1 calculate scaled residuals by divividing by this value. Probably meaningful only if residual=TRUE.

Details

This function is used by mixFilter. Applies an autoregressive filter to a time series for indices specified by index.

Note that `filter' here is equivalent to calculating one-step predictions (or residuals if residual=TRUE) from autoregressions.

index should not specify indices smaller than length(filter)+1 or larger than length(x)+1. The value length(x)+1 can legitimately be used to calculate a prediction (but not a residual of course) for the first value after the end of the series.