A measure of the normal variation within a set of data. In any given measurement, two-thirds of the samples fall within one standard deviation on either side of the mean, 95% between two standard deviations, and so on; the proportion falls off sharply because of the bell-curve effect. The standard deviation is calculated as the root-mean-square deviation....
Reference Entry. 59 words.
Subjects: Earth Sciences and Geography
Full text: subscription required
Users without a subscription are not able to see the full content. Please, subscribe or login to access all content. subscribe or purchase to access all content.