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copied!<p>you can redifine the funcition</p> <pre><code>GeomBoxplot$draw<-function (., data, ..., outlier.colour = "black", outlier.shape = 16, outlier.size = 2, outlier.jitter=0) { defaults <- with(data, data.frame(x = x, xmin = xmin, xmax = xmax, colour = colour, size = size, linetype = 1, group = 1, alpha = 1, fill = alpha(fill, alpha), stringsAsFactors = FALSE)) defaults2 <- defaults[c(1, 1), ] if (!is.null(data$outliers) && length(data$outliers[[1]] >= 1)) { pp<-position_jitter(width=outlier.jitter,height=0) p<-pp$adjust(data.frame(x=data$x[rep(1, length(data$outliers[[1]]))], y=data$outliers[[1]]),.scale) outliers_grob <- GeomPoint$draw(data.frame(x=p$x, y = p$y, colour = I(outlier.colour), shape = outlier.shape, alpha = 1, size = outlier.size, fill = NA), ...) } else { outliers_grob <- NULL } with(data, ggname(.$my_name(), grobTree(outliers_grob, GeomPath$draw(data.frame(y = c(upper, ymax), defaults2), ...), GeomPath$draw(data.frame(y = c(lower, ymin), defaults2), ...), GeomRect$draw(data.frame(ymax = upper, ymin = lower, defaults), ...), GeomRect$draw(data.frame(ymax = middle, ymin = middle, defaults), ...)))) } ggplot(test, aes(x=places,y=value))+geom_boxplot(outlier.jitter=0.05) </code></pre> <p>This is ad-hoc solution. Of course, in the sense of OOP, you should create a sub-class of GeomBoxplot and override the function. This is easy because ggplot2 is nice.</p> <p>=== added for example of sub-class definition ===</p> <pre><code>GeomBoxplotJitterOutlier <- proto(GeomBoxplot, { draw <- function (., data, ..., outlier.colour = "black", outlier.shape = 16, outlier.size = 2, outlier.jitter=0) { # copy the body of function 'draw' above and paste here. } objname <- "boxplot_jitter_outlier" desc <- "Box and whiskers plot with jittered outlier" guide_geom <- function(.) "boxplot_jitter_outlier" }) geom_boxplot_jitter_outlier <- GeomBoxplotJitterOutlier$build_accessor() </code></pre> <p>then you can do with your sub-class:</p> <pre><code>ggplot(test, aes(x=places,y=value))+geom_boxplot_jitter_outlier(outlier.jitter=0.05) </code></pre>

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