title: How to make categorical scatterplot in R with median marking
body: <p>My data are set up so that one column contains a continuous value testosterone concentration and the second column contains one of four "Kit type" values being "EIA," "RIA," "Other," or "All." I wanted to make the kit types into categories along the x axis with testosterone concentration along the y. I can't seem to figure out how to make sort of a cross between a boxplot and a scatterplot, but with only the individual data points and a median marking for each category marked on the graph?</p>
  
  <p>This seemed to get me the data points into catagories alright, but the summarySE function does not have a median: <a href="https://stackoverflow.com/questions/17807774/categorical-scatter-plot-with-mean-segments-using-ggplot2-in-r">Categorical scatter plot with mean segments using ggplot2 in R</a></p>