| Author |
Comment/Response |
mike
|
 04/26/07 03:34am
Hi,
I am using BoxWhiskerPlot from Statistics`StatisticsPlots` to create a box-plot for some data. However, the quartiles seem to be incorrect in the graphic returned.
For example,
I create BoxWhiskerPlot for the following 20 values.
l = {40, 42, 44, 44, 45, 50, 51, 52, 53, 56, 56, 59, 59, 60, 69, 73, 77, 78, 83, 84};
n = number of elements in list = 20
Q1 - the lower quartile should be the (n + 1)/4 th value which in this case is 46.25 but appears to be 45 on the plot.
Q2 - the mean is 56 which is correct on the plot.
Q3 - should be 3*(n + 1)/4 th which is 15.75th = 72 but appears to be 69 on the box-plot.
Any ideas?
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