What I think is complicating the issue is that my box plot is dynamically created.
Box and whisker excel 2013 how to#
Box and whisker excel 2013 plus#
The Tukey whiskers always stop at the value of a data point, and do not extenda all the way to the 75th percentile plus 1.5IQR or all the way down to the 25th percentile minus 1.5IQR. 2013 to correctly explain what Prism does. It will not plot the percentiles and will ignore your choice for how to plot the whiskers.
If you only enter three values per group (n=3), Prism will plot the median and range.The chance of finding one or more "outlier" by Tukey's rule in data sampled from a Gaussian distribution depends on sample size. The values that are plotted individually are sometimes called outliers, but "outlier" is defined differently by Grubbs test or some other outlier test.We fixed this inconsistency in 6.02 and 6.0c, and now do not pot that point individually. However, if the smallest value preceisly equals the 25th percentile minus 1.5IQR then Prism did plot the point as an outlier. If the largest value preciesly equals the 75th percentile plus 1.5IQR, Prism (up to 6.01 and 6.0b) does not plot that value as an outlier.When the Tukey method is used to create the whiskers, the ends of the whiskers are sometimes called the inner fences.Why 1.5IQR? There is no statistical rationale it is simply how Tukey decided to do it, and he invented the idea of box-and-whisker plots.
Otherwise stop the lower whisker at the lowest value greater than the 25th percentile minues 1.5IQR, and plot any values that are less than this as individual points. If this value is less than the smallest value in the data set, draw the lower whisker to the smallest value. Calculate the 25th percentile minus 1.5IQR.Otherwise stop the upper whisker at the the largest value less than the sum of the 75th percentile plus 1.5IQR, and plot any values that are greater than this as individual points. If this value is greater than (or equal to) the largest value in the data set, draw the upper whisker to the largest value. Add the 75th percentile plus 1.5 times IQR.Calculate the interquartile range (the difference between the 25th and 75th percentiles).This method plots whiskers down to the minimum and up to the maximum value, but also plots each individual value as a dot superimposed on the graphīecause whiskers can be created in so many ways, it is essential to mention in a graph's figure legend which method you chose.ĭetails of the Tukey method for plotting the whiskers and outliers: Points below and above the whiskers are drawn as individual dots. The whiskers are drawn down to the 10th percentile and up to the 90th. For box-and-whisker plots of XY data, Prism always plots like this and offers no choice. The whiskers go down to the smallest value and up to the largest. Prism offers five choices for drawing the whiskers in box-and-whiskers plots for column and grouped data: You can not choose a different value, but Prism also lets you put a "+" at the mean. The line in the middle of the box is plotted at the median. Prism uses a standard method, but a different method than Excel uses. Surprisingly, there are multiple ways to compute these percentile values. These limits are sometimes called the hinges of the plot. The box always extends from the 25th to 75th percentiles.
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