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#' Plot fo the time series and its smoothed version in ggplo
#'
#' It plots the univariate or bivariate time series and its smoothed version (trend) using ggplot. It directly uses the output of trend_estimate.
#'
#' @param smoothedTS Is an object generated by the function trend_estimate
#' @param title Main title of the graph
#' @param xlab Common x label
#' @param ylab A 2-length vector of characters.
#'
#'
#'
#' @return The ggplot of the original time series, their treind and its approximated 95% bands
#'
plot_trend<-function(smoothedTS, title = NULL, xlab = "Time", ylab = names(dat)[1:2]){
dvar<-smoothedTS$diag.var.tau
tau<-smoothedTS$tau
if(smoothedTS$bivariate){
dat<-as.data.frame(smoothedTS$dat)
p1 <- ggplot() +
geom_point(data=dat, aes(x = as.numeric(time(smoothedTS$dat)), y = dat[,1]), col = rgb(0,0.7,0.7,1))+
labs(title = title, y = ylab[1])+
theme(axis.title.x = element_blank(),
axis.text.x = element_blank(),
axis.ticks.x = element_blank())+
geom_line(data = dat, aes(x = as.numeric(time(smoothedTS$dat)), y = dat[,1]),col = rgb(0,0.7,0.7,1)) +
geom_line(aes(x = as.numeric(time(smoothedTS$dat)), y = tau[,1]))+
geom_ribbon(aes(x = as.numeric(time(smoothedTS$dat)),ymin = tau[,1]-2*sqrt(dvar[,1]), ymax = tau[,1]+2*sqrt(dvar[,1])),
alpha = 0.25,
linetype = 1,
#colour = rgb(0,0.7,0.7,1), #border line color
size = 1,
fill = rgb(0,0.7,0.7,1))#+
#theme(legend.position = c(0, 1),
# legend.justification = c(0, 1))
p2 <- ggplot() +
geom_point(data = dat, aes(x = as.numeric(time(smoothedTS$dat)), y = dat[,2]), col = rgb(0,0.7,0.7,1))+
labs( y = ylab[2], x = xlab)+
geom_line(data = dat, aes(x = as.numeric(time(smoothedTS$dat)), y = dat[,2]),col = rgb(0,0.7,0.7,1)) +
geom_line(aes(x = as.numeric(time(smoothedTS$dat)), y = tau[,2]))+
geom_ribbon(aes(x = as.numeric(time(smoothedTS$dat)),ymin = tau[,2]-2*sqrt(dvar[,2]), ymax = tau[,2]+2*sqrt(dvar[,2])),
alpha = 0.25,
linetype = 1,
#colour = rgb(0,0.7,0.7,1), #border line color
size = 1,
fill = rgb(0,0.7,0.7,1))
grid.arrange(p1, p2, nrow = 2)
}else{ #only one serie
dat<-as.numeric(smoothedTS$dat)
ggplot() +
geom_point(aes(x = as.numeric(time(smoothedTS$dat)), y = dat),col = rgb(0,0.7,0.7,1)) +
labs( title = title, y = ylab, x = xlab)+
geom_line(aes(x = as.numeric(time(smoothedTS$dat)), y = dat),col = rgb(0,0.7,0.7,1)) +
geom_line(aes(x = as.numeric(time(smoothedTS$dat)), y = tau))+
geom_ribbon(aes(x = as.numeric(time(smoothedTS$dat)), ymin = tau-2*sqrt(dvar), ymax = tau+2*sqrt(dvar)),
alpha = 0.25,
linetype = 1,
size = 1,
fill = rgb(0,0.7,0.7,1))
}
}
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