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    <p>you can redifine the funcition</p> <pre><code>GeomBoxplot$draw&lt;-function (., data, ..., outlier.colour = "black", outlier.shape = 16, outlier.size = 2, outlier.jitter=0) { defaults &lt;- with(data, data.frame(x = x, xmin = xmin, xmax = xmax, colour = colour, size = size, linetype = 1, group = 1, alpha = 1, fill = alpha(fill, alpha), stringsAsFactors = FALSE)) defaults2 &lt;- defaults[c(1, 1), ] if (!is.null(data$outliers) &amp;&amp; length(data$outliers[[1]] &gt;= 1)) { pp&lt;-position_jitter(width=outlier.jitter,height=0) p&lt;-pp$adjust(data.frame(x=data$x[rep(1, length(data$outliers[[1]]))], y=data$outliers[[1]]),.scale) outliers_grob &lt;- GeomPoint$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 &lt;- 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$draw(data.frame(ymax = middle, ymin = middle, defaults), ...)))) } ggplot(test, aes(x=places,y=value))+geom_boxplot(outlier.jitter=0.05) </code></pre> <p>This is ad-hoc solution. Of course, in the sense of OOP, you should create a sub-class of GeomBoxplot and override the function. This is easy because ggplot2 is nice.</p> <p>=== added for example of sub-class definition ===</p> <pre><code>GeomBoxplotJitterOutlier &lt;- proto(GeomBoxplot, { draw &lt;- function (., data, ..., outlier.colour = "black", outlier.shape = 16, outlier.size = 2, outlier.jitter=0) { # copy the body of function 'draw' above and paste here. } objname &lt;- "boxplot_jitter_outlier" desc &lt;- "Box and whiskers plot with jittered outlier" guide_geom &lt;- function(.) "boxplot_jitter_outlier" }) geom_boxplot_jitter_outlier &lt;- GeomBoxplotJitterOutlier$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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    1. COThis looks nice! - thank you. how would I go about creating a sub-class? I can't find ref to this in hadleys book - and I am not apt in OOP :-)
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    2. COI put an example above.
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