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#' Graphical representation based on sigma convergence
#'
#' A ggplot of the standard deviation and the coefficient of variation based on the results obtained for sigma-convergence
#'
#' @param sigmaconvOut the output obtained from sigma_conv function.
#' @param time_0 starting time.
#' @param time_t ending time.
#' @param aggregation the name of the set of member states for which the sigma-convergence is calculated.
#' @param x_angle axis orientation for time labels, default 45.
#' @return a ggplot object to be displayed of saved using ggsave.
#'
#'
#' @references{\url{https://unimi2013-my.sharepoint.com/:u:/g/personal/federico_stefanini_unimi_it/EW0cVSIgbtZAvLPNbqcxdX8Bfn5VGSRHfAH88hQwc_RIEQ?e=MgtSZu}}
#'
#' @examples
#'
#' # Example 1
#' # Sigma convergence for the emp_20_64_MS Eurofound dataset in the period 2002-2006:
#' data(emp_20_64_MS)
#' reSigConv <- sigma_conv(emp_20_64_MS, timeName = "time", time_0 = 2002,time_t = 2006)
#'
#' # Graphical plot based on the results for sigma-convergence
#' reSiggraph<-sigma_conv_graph(reSigConv,2002,2006,aggregation = 'EU27')
#'
#' # Example 2
#' # Sigma-convergence for the emp_20_64_MS Eurofound dataset in the period 2008-2016:
#' reSigConv1 <- sigma_conv(emp_20_64_MS, timeName = "time", time_0 = 2008,time_t = 2016)
#'
#' # Graphical plot based on the results for sigma-convergence
#' reSiggraph1<-sigma_conv_graph(reSigConv1,2008,2016,aggregation = 'EU27')
#'
#' # Select different time windows, e.g. 2012-2016 and change x_angle:
#' reSiggraph2<-sigma_conv_graph(reSigConv1,2012,2016,aggregation = 'EU27', x_angle=90)
#'
#' @export
#'
#' @importFrom rlang .data
#'
sigma_conv_graph <- function(sigmaconvOut,
time_0 = NA,
time_t = NA,
aggregation=NA,
x_angle=45
)
{
ptime_0<-time_0
ptime_t<-time_t
worktb<- dplyr::filter(sigmaconvOut$res,.data$time >= ptime_0,
.data$time <= ptime_t)
plot2sig <- ggplot2::qplot(worktb$time,worktb$stdDev,
xlab= paste("Years "),
ylab=aggregation) +
ggplot2::geom_line() +
ggplot2::scale_x_continuous(
breaks = seq(ptime_0,ptime_t),
labels = seq(ptime_0,ptime_t)) +
ggplot2::theme(
axis.text.x=ggplot2::element_text(
angle = x_angle ,
vjust = 1,
hjust=1)) +
ggplot2::ggtitle(paste("Standard Deviation"))
plot3sig <- ggplot2::qplot( worktb$time,worktb$CV*100,
xlab= paste("Years "),
ylab=aggregation
) +
ggplot2::geom_line() +
ggplot2::scale_x_continuous(
breaks = seq(ptime_0,ptime_t),
labels = seq(ptime_0,ptime_t)) +
ggplot2::theme(
axis.text.x=ggplot2::element_text(
angle = x_angle ,
vjust = 1,
hjust=1)) +
ggplot2::ggtitle(paste("Coefficient of variation"))
sigma_gr <- ggpubr::ggarrange(
plot2sig,plot3sig)
return(sigma_gr)
}
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