![]() Points below and above the whiskers are drawn as individual points. The whiskers are drawn down to the 10th percentile and up to the 90th. ![]() The whiskers go down to the smallest value and up to the largest. Prism offers six ways to create whiskers in box-and-whiskers plots: 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. Prism lets you create box-and-whisker plots from stacks of values entered into a Column table, or side-by-side replicates entered into an XY or Grouped table. We can look at our data with these upper and lower fences and see that 2017's rainfall of 6.32 6.32 6.32 is an outlier.Before creating a box-whiskers plot, consider a violin plot instead. We denote the first quartile with Q 1 Q_1 Q 1 and the third quartile with Q 3 Q_3 Q 3 . There are a few steps involved, so let's get started!īefore we can get to the upper and lower fence formulas, we need two basic but important values: the dataset's quartiles. Now that we know what the fences are, we'd love to know exactly how to find the upper and lower fence.
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