#' @title Priestley-Subba Rao (PSR) Stationarity Test
#'
#' @description
#' Priestley-Subba Rao stationarity test.
#'
#' @param data Time series data
#' @param alpha Value of alpha for the statistics test
#'
#' @return 0: Non-Stationary, 1: Stationary, NA: Unable to test
#'
#' @importFrom fractal stationarity
#'
priestley.subba.rao.test <- function(data, alpha){
p <- NULL
tryCatch(p <- stationarity(data, significance=alpha),
error=function(e){return(NA)})
if(!is.null(p)){
if((attr(p, "pvals")[1]) <= alpha){
return(NONSTATIONARY)
} else {
return(STATIONARY)
}
}
return(NA)
}
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