back-to-back stem-and-leaf plot

a variation of a stem-and-leaf plot in which the trailing digits (leaves) from two data sets are displayed on either side of the same central column of initial values (stem). The leaf values from one data set are given on the right-hand side while those of the second group are shown on the left-hand side. For example, consider the following hypothetical sets of test scores obtained by participants on two different occasions:
79 79 83 83 86 87 92 99

and
80 81 82 83 87 87 90 99

The back-to-back stem-and-leaf plot for these values is

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Psychology term of the day

February 17th 2025

sexually dimorphic nucleus

a nucleus of the central nervous system that differs in size between males and females. In humans, for example, a nucleus in the medial preoptic area of the hypothalamus that synthesizes gonadotropin-releasing hormone tends to be larger and more active in males than in females because gonadotropin release is continuous (it is cyclical in females). In songbirds whose males sing more than females, several brain nuclei associated with both song learning and song production are larger in males than in females.