Stem and Leaf (2 of 2)

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When a stem is displayed twice, (as in the example shown below) one stem is associated with the leaves 5-9 and the other stem is associated with the leaves 0-4.



Finally, when a stem is displayed five times, the first has the leaves 8-9, the second 6-7, the third 4-5, and so on.

If positive and negative numbers are both present, +0 and -0 are used as stems as they are in the plot . A stem of -0 and a leaf of 7 is a value of (-0 x 1) + (-0.1 x 7) = -0.7.

There is a variation of stem and leaf displays that is useful for comparing distributions. The two distributions are placed back to back along a common column of stems. The figure below shows such a graph. It compares two distributions. The stems are in the middle, the leaves to the left are for one distribution, and the leaves to the right are for the other. For example, the second-to-last row shows that the distribution on the left contains the values 11, 12, and 13 whereas the distribution on the right contains two 12's and three 14's.
11

332
8865
44331110
987776665
321
7
 4
3
3
2
2
1
1
0
7
233
889
001112223
56888899
22444
69


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