splice_index {gpindex}

Splice an index series

Description

Splice a collection of index series computed over a rolling window into one index series. Splicing on multiple points combines the results with a geometric mean.

Usage

splice_index(x, periods = NULL, initial = NULL, published = FALSE)

Arguments

x

A list of equal-length numeric vectors giving the period-over-period indexes for each window.

periods

An integer vector giving the splice points for each window. The default splices on each point in the window.

initial

A numeric vector giving an initial period-over-period index series onto which the elements of x are spliced. The default uses the first element of x.

published

Should the splice be done against the published series? The default splices using the recalculated index series.

Value

A numeric vector giving the spliced (fixed-base) index series.

References

Chessa, A. G. (2019). A Comparison of Index Extension Methods for Multilateral Methods. Paper presented at the 16th Meeting of the Ottawa Group on Price Indices, 8-10 May 2019, Rio de Janeiro, Brazil.

Krsinich, F. (2016). The FEWS index: Fixed effects with a window splice. Journal of Official Statistics, 32(2), 375-404.

See Also

Other price index functions: geks(), index_weights(), price_indexes

Examples

# Make an index series over a rolling window
x <- list(c(1.1, 0.9, 1.2), c(0.8, 1.3, 1.4), c(1.3, 1.3, 0.8))

# Mean splice

splice_index(x)

# Movement splice

splice_index(x, 3)

# Window splice

splice_index(x, 1)

# Splicing on the published series preserves the within-window
# movement of the index series

splice_index(x, 1, published = TRUE)