#' @title Plot method for IWT results on functional ANOVA
#'
#' @description \code{plot} method for class "\code{IWTaov}".
#' Plotting function creating a graphical output of the IWT for the test on a functional analysis of variance:
#' functional data, and IWT-adjusted p-values of the F-tests on the whole model and on each factor are plotted.
#'
#' @param x The object to be plotted. An object of class "\code{IWTaov}", usually, a result of a call
#' to \code{\link{IWTaov}}.
#'
#' @param xrange Range of the \code{x} axis.
#'
#' @param alpha1 First level of significance used to select and display significant effects. Default is \code{alpha1 = 0.05}.
#'
#' @param alpha2 Second level of significance used to select and display significant effects. Default is \code{alpha1 = 0.01}.
#' \code{alpha1} and \code{alpha2} are s.t. \code{alpha2 < alpha1}. Otherwise the two values are switched.
#'
#' @param plot_adjpval A logical indicating wether the plots of adjusted p-values have to be done. Default is \code{plot_adjpval = FALSE}.
#'
#' @param ylim Range of the \code{y} axis. Default is \code{NULL}, giving a plot with authomatic range for functional data.
#'
#' @param col Colors for the plot of functional data. Default is \code{col = 1}.
#'
#' @param ylab Label of \code{y} axis of the plot of functional data. Default is "\code{Functional Data}".
#'
#' @param main An overall title for the plots (it will be pasted to "Functional Data and F-test" for the first plot and to factor names for the other plots).
#'
#' @param lwd Line width for the plot of the adjusted p-value function. Default is \code{lwd=1}.
#'
#' @param type line type for the plot of the adjusted p-value function. Default is type='l'.
#'
#' @param ... Additional plotting arguments that can be used with function \code{plot},
#' such as \code{\link{graphical parameters}} (see \code{\link{par}}).
#'
#' @return No value returned.
#' The function produces a graphical output of the IWT results: the plot of the functional data and the one of the adjusted p-values.
#' The portions of the domain selected as significant by the test at level \code{alpha1} and \code{alpha2} are highlighted in the plot of the adjusted p-value function and in the one of functional data by gray areas (light and dark gray, respectively).
#' The first plot reports the gray areas corresponding to a significant F-test on the whole model. The remaining plots report the gray areas corresponding to significant F-tests on each factor (with colors corresponding to the levels of the factor).
#'
#' @seealso \code{\link{IWTimage}} for the plot of p-values heatmaps.
#' See also \code{\link{IWT1}}, \code{\link{IWT2}} to perform the ITP to test on the mean of one population and test of differences between two populations.
#' See \code{\link{ITPaovbspline}} for functional ANOVA based on B-spline basis representation
#'
#' @examples
#' # Importing the NASA temperatures data set
#' data(NASAtemp)
#'
#' temperature <- rbind(NASAtemp$milan,NASAtemp$paris)
#' groups <- c(rep(0,22),rep(1,22))
#'
#' # Performing the IWT
#' IWT.result <- IWTaov(temperature ~ groups,B=1000)
#'
#' # Summary of the IWT results
#' summary(IWT.result)
#'
#' # Plot of the IWT results
#' layout(1)
#' plot(IWT.result)
#'
#' # All graphics on the same device
#' layout(matrix(1:4,nrow=2,byrow=FALSE))
#' plot(IWT.result,main='NASA data', plot_adjpval = TRUE,xlab='Day',xrange=c(1,365))
#'
#' @references
#' Pini, A., & Vantini, S. (2017). Interval-wise testing for functional data. \emph{Journal of Nonparametric Statistics}, 29(2), 407-424
#'
#' Pini, A., Vantini, S., Colosimo, B. M., & Grasso, M. (2018). Domain‐selective functional analysis of variance for supervised statistical profile monitoring of signal data. \emph{Journal of the Royal Statistical Society: Series C (Applied Statistics)} 67(1), 55-81.
#'
#' Abramowicz, K., Hager, C. K., Pini, A., Schelin, L., Sjostedt de Luna, S., & Vantini, S. (2018).
#' Nonparametric inference for functional‐on‐scalar linear models applied to knee kinematic hop data after injury of the anterior cruciate ligament. \emph{Scandinavian Journal of Statistics} 45(4), 1036-1061.
#'
#' @export
plot.IWTaov <- function(x, xrange = c(0,1),
alpha1 = 0.05, alpha2 = 0.01,
plot_adjpval = FALSE,
ylim = NULL, col = 1,
ylab = 'Functional Data',
main = NULL, lwd = 0.5, type='l', ...) {
if (class(x) != "IWTaov") stop("x should be an object of the class IWTaov")
if (alpha1 < alpha2) {
temp <- alpha1
alpha1 <- alpha2
alpha2 <- temp
}
object <- x
nvar <- dim(object$adjusted_pval_factors)[1]
p <- length(object$unadjusted_pval_F)
n <- dim(t(object$data.eval))[1]
xmin <- xrange[1]
xmax <- xrange[2]
abscissa_pval = seq(xmin, xmax, len = p)
devAskNewPage(ask = TRUE)
main_f <- paste(main, ': Functional Data and F-test')
main_f <- sub("^ : +", "", main_f)
if (is.null(ylim)) ylim <- range(object$data.eval)
if(nvar>1){
matplot(abscissa_pval, t(object$data.eval), type = 'l', col = col, main = main_f,
ylab = ylab, ylim = ylim, lwd = lwd, ...)
difference1 <- which(object$adjusted_pval_F < alpha1)
if (length(difference1) > 0) {
for (j in 1:length(difference1)) {
min_rect <- abscissa_pval[difference1[j]] - (abscissa_pval[2] - abscissa_pval[1])/2
max_rect <- min_rect + (abscissa_pval[2] - abscissa_pval[1])
rect(min_rect, par("usr")[3], max_rect, par("usr")[4], col = "gray90",
density = -2, border = NA)
}
rect(par("usr")[1], par("usr")[3], par("usr")[2],par("usr")[4], col = NULL,
border = "black")
}
difference2 <- which(object$adjusted_pval_F < alpha2)
if (length(difference2) > 0) {
for (j in 1:length(difference2)) {
min_rect <- abscissa_pval[difference2[j]] - (abscissa_pval[2] - abscissa_pval[1])/2
max_rect <- min_rect + (abscissa_pval[2] - abscissa_pval[1])
rect(min_rect, par("usr")[3], max_rect, par("usr")[4], col = "gray80",
density = -2, border = NA)
}
rect(par("usr")[1], par("usr")[3], par("usr")[2],par("usr")[4], col = NULL,
border = "black")
}
matplot(abscissa_pval, t(object$data.eval), type = 'l',
col = col, add = TRUE, lwd = lwd, ...)
}
names_all <- colnames(object$design_matrix)
interaz <- grep(':', names_all)
for (var in 1:(dim(object$adjusted_pval_factors)[1])) {
var_name <- rownames(object$adjusted_pval_factors)[var]
main_t <- paste(main, ': factor', var_name, sep = ' ')
main_t <- sub("^ : +", "", main_t)
if (length(grep(':', var_name)) > 0) { # Plot interaction
var12 <- strsplit(var_name, ':')
var1 <- var12[[1]][1]
var2 <- var12[[1]][2]
dummy_test1 <- grep(var1, names_all)
dummy_test2 <- grep(var2, names_all)
dummy_test <- intersect(dummy_test1, dummy_test2)
colors <- object$design_matrix[, dummy_test]
if (length(dim(colors)) > 1) {
colors <- (apply(colors, 1, paste, collapse = ''))
}
colors <- as.factor(colors)
} else { # Plot of a factor
dummy_test <- grep(var_name, names_all)
dummy_test <- setdiff(dummy_test, interaz)
colors <- object$design_matrix[, dummy_test]
if (length(dim(colors)) > 1) {
colors <- (apply(colors, 1, paste, collapse = ''))
}
colors <- as.factor(colors)
}
matplot(abscissa_pval, t(object$data.eval),type = 'l', col = colors, ylim = ylim,
lwd = 1, main = main_t, ylab = ylab, ...)
difference1 <- which(object$adjusted_pval_factors[var,] < alpha1)
if (length(difference1) > 0) {
for (j in 1:length(difference1)) {
min_rect <- abscissa_pval[difference1[j]] - (abscissa_pval[2] - abscissa_pval[1])/2
max_rect <- min_rect + (abscissa_pval[2] - abscissa_pval[1])
rect(min_rect, par("usr")[3], max_rect, par("usr")[4], col = "gray90",
density = -2, border = NA)
}
rect(par("usr")[1], par("usr")[3], par("usr")[2],par("usr")[4],
col = NULL, border = "black")
}
difference2 <- which(object$adjusted_pval_factors[var,] < alpha2)
if (length(difference2) > 0) {
for (j in 1:length(difference2)) {
min_rect <- abscissa_pval[difference2[j]] - (abscissa_pval[2] - abscissa_pval[1])/2
max_rect <- min_rect + (abscissa_pval[2] - abscissa_pval[1])
rect(min_rect, par("usr")[3], max_rect, par("usr")[4], col = "gray80",
density = -2, border = NA)
}
rect(par("usr")[1], par("usr")[3], par("usr")[2],par("usr")[4],
col = NULL, border = "black")
}
matlines(abscissa_pval, t(object$data.eval), type='l', col=colors, ...)
abline(h = 0, lty = 2, col = 1)
}
# Plot adjusted p-values
if (plot_adjpval == TRUE) {
main_p <- paste(main, ': Adjusted p-values - F-test')
main_p <- sub("^ : +", "", main_p)
plot(abscissa_pval, object$adjusted_pval_F, ylim = c(0, 1),
main = main_p, ylab = 'p-value',type=type,lwd=2, ...)
difference1 <- which(object$adjusted_pval_F < alpha1)
if (length(difference1) > 0) {
for (j in 1:length(difference1)) {
min_rect <- abscissa_pval[difference1[j]] - (abscissa_pval[2] - abscissa_pval[1])/2
max_rect <- min_rect + (abscissa_pval[2] - abscissa_pval[1])
rect(min_rect, par("usr")[3], max_rect, par("usr")[4], col = "gray90",
density = -2, border = NA)
}
rect(par("usr")[1], par("usr")[3], par("usr")[2],par("usr")[4],
col = NULL, border = "black")
}
difference2 <- which(object$adjusted_pval_F < alpha2)
if (length(difference2) > 0) {
for (j in 1:length(difference2)) {
min_rect <- abscissa_pval[difference2[j]] - (abscissa_pval[2] - abscissa_pval[1])/2
max_rect <- min_rect + (abscissa_pval[2] - abscissa_pval[1])
rect(min_rect, par("usr")[3], max_rect, par("usr")[4], col = "gray80",
density = -2, border = NA)
}
rect(par("usr")[1], par("usr")[3], par("usr")[2],par("usr")[4],
col = NULL, border = "black")
}
for (j in 0:10) {
abline(h = j / 10, col = 'lightgray', lty = "dotted")
}
lines(abscissa_pval, object$adjusted_pval_F, lwd=2, type=type,...)
for (var in 1:(dim(object$adjusted_pval_factors)[1])) {
var_name <- rownames(object$adjusted_pval_factors)[var]
main_p <- paste(main, ': Adjusted p-values - factor', var_name)
main_p <- sub("^ : +", "", main_p)
plot(abscissa_pval, object$adjusted_pval_factors[var, ],
ylim = c(0, 1), main = main_p, ylab = 'p-value',lwd=2,type=type, ...)
difference1 <- which(object$adjusted_pval_factors[var,] < alpha1)
if (length(difference1) > 0) {
for (j in 1:length(difference1)) {
min_rect <- abscissa_pval[difference1[j]] - (abscissa_pval[2] - abscissa_pval[1])/2
max_rect <- min_rect + (abscissa_pval[2] - abscissa_pval[1])
rect(min_rect, par("usr")[3], max_rect, par("usr")[4], col = "gray90",
density = -2, border = NA)
}
rect(par("usr")[1], par("usr")[3], par("usr")[2],par("usr")[4],
col = NULL, border = "black")
}
difference2 <- which(object$adjusted_pval_factors[var,] < alpha2)
if (length(difference2) > 0) {
for (j in 1:length(difference2)) {
min_rect <- abscissa_pval[difference2[j]] - (abscissa_pval[2] - abscissa_pval[1])/2
max_rect <- min_rect + (abscissa_pval[2] - abscissa_pval[1])
rect(min_rect, par("usr")[3], max_rect, par("usr")[4], col = "gray80",
density = -2, border = NA)
}
rect(par("usr")[1], par("usr")[3], par("usr")[2],par("usr")[4],
col = NULL, border = "black")
}
for (j in 0:10) {
abline(h = j / 10, col = 'lightgray', lty = "dotted")
}
lines(abscissa_pval, object$adjusted_pval_factors[var,],type=type,lwd=2, ...)
}
}
devAskNewPage(ask = FALSE)
}
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