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Community Trekker


Jun 23, 2011

quantile box plots

Anyone know why the quantiles box plot is seemingly different depending on the platform used.? E.g. for the distrbution platform the end of the whiskers are 0% and 100% (i.e. min and max values). For Fit Y by X the quantile box plot ends are 10 ad 90%. Then of course there is the graph builder platform. Going back to the distribution platform the 2nd lines are 2.5 and 97.5%, however I have sometimes seen these as 10% and 90%.

Can anyone shed any light onto the underlying logic behind these differences..?

Another question: is there an easy way to add confidence interval (like mean diamonds) to the median values on quantile box plot..? Normally for my data I expect the median to be the most meaningful number (with obvious outliers filtered out). Therefore, for comparing groups I would like to focus on median values with some confidence interval added.