#' Pacific Decadal Oscillation Index
#'
#' Monthly Pacific Decadal Oscillation (PDO) index values.
#'
#' For more information see <https://github.com/poissonconsulting/rpdo>.
#'
#' @format A tbl data frame:
#' \describe{
#' \item{Year}{The year as an integer.}
#' \item{Month}{The month as an integer.}
#' \item{PDO}{The Pacific Decadal Oscillation index as a numeric.}
#' }
#' @examples
#' library(rpdo)
#' library(ggplot2)
#'
#' data(pdo)
#' ggplot(data = subset(pdo, pdo$Month == 1), aes(x = Year, y = PDO)) +
#' geom_line() +
#' ylab("January PDO Index")
"pdo"
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