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help_plot <- function(data , stlab, title, xlabel, ylabel, sta){
# provide a plot for outlier detection measure considering deletion
data <- t(data)
colnames(data) <- stlab
melt_data <- melt(data)
y_values <- melt_data$value
var2_factors <- as.factor(melt_data$Var2)
if (sta == "residual") {
ggplot(data = melt_data, aes(x = var2_factors, y = y_values)) +
theme(panel.background = element_rect(fill = '#fafafa'), panel.grid.major = element_line(colour = "#efefef")) +
geom_point(color = '#016FB9', size = 3, na.rm = TRUE) + geom_hline(yintercept = 2) +
geom_hline(yintercept = 1.96, linetype = "dashed") + geom_hline(yintercept = -2) +
geom_hline(yintercept = -1.96, linetype = "dashed") +
labs(title = title, y = ylabel, x = xlabel)
} else if (sta == "cook" || sta == "covratio") {
ggplot(data = melt_data, aes(x = var2_factors, y = y_values)) +
theme(panel.background = element_rect(fill = '#fafafa'), panel.grid.major = element_line(colour = "#efefef")) +
geom_point(color = '#016FB9', size = 3, na.rm = TRUE) +
geom_hline(yintercept = 1, linetype = "dashed") +
labs(title = title, y = ylabel, x = xlabel)
} else {
ggplot(data = melt_data, aes(x = var2_factors, y = y_values)) +
theme(panel.background = element_rect(fill = '#fafafa'), panel.grid.major = element_line(colour = "#efefef")) +
geom_point(color = '#016FB9', size = 3, na.rm = TRUE) +
labs(title = title, y = ylabel, x = xlabel)
}
}
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