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% Generated by roxygen2: do not edit by hand
% Please edit documentation in R/mwar.ani.R
\name{mwar.ani}
\alias{mwar.ani}
\title{Demonstration for ``Moving Window Auto-Regression''}
\usage{
mwar.ani(
x,
k = 15,
conf = 2,
mat = matrix(1:2, 2),
widths = rep(1, ncol(mat)),
heights = rep(1, nrow(mat)),
lty.rect = 2,
...
)
}
\arguments{
\item{x}{univariate time-series (a single numerical vector); default to be
\code{sin(seq(0, 2 * pi, length = 50)) + rnorm(50, sd = 0.2)}}
\item{k}{an integer of the window width}
\item{conf}{a positive number: the confidence intervals are computed as
\code{c(ar1 - conf*s.e., ar1 + conf*s.e.)}}
\item{mat, widths, heights}{arguments passed to \code{\link{layout}} to divide
the device into 2 parts}
\item{lty.rect}{the line type of the rectangles respresenting the moving
``windows''}
\item{\dots}{other arguments passed to \code{\link{points}} in the bottom
plot (the centers of the arrows)}
}
\value{
A list containing \item{phi }{the AR(1) coefficients} \item{L }{lower
bound of the confidence interval} \item{U }{upper bound of the confidence
interval}
}
\description{
This function just fulfills a very naive idea about moving window regression
using rectangles to denote the ``windows'' and move them, and the
corresponding AR(1) coefficients as long as rough confidence intervals are
computed for data points inside the ``windows'' during the process of moving.
}
\details{
The AR(1) coefficients are computed by \code{\link{arima}}.
}
\references{
Examples at \url{https://yihui.org/animation/example/mwar-ani/}
Robert A. Meyer, Jr. Estimating coefficients that change over
time. \emph{International Economic Review}, 13(3):705-710, 1972.
}
\seealso{
\code{\link{arima}}
}
\author{
Yihui Xie
}
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