An indicator used on a graph or histogram to show the the variability of the average (the standard error of the mean). This gives some idea of the accuracy of the average measure. It is usually in the form of small 'T' shaped bars extending above and below the central point on the graph.
Also used in hcistats2e: Chap. 1: page 13; Chap. 13: page 150
Used in glossary entries: standard error (s.e.)