Measures of variability for geological data |
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| Authors: | D F Watson and G M Philip |
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| Institution: | (1) The Earth Resources Foundation, The University of Sydney, 2006 Sydney, Australia;(2) P.O. Box 48, 2037 Glebe, N.S.W., Australia |
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| Abstract: | Diverse global and local measures of variability appear in the geological literature and, along with methods used to apply them, have been subject to some debate. Measures of variability for three data types—replicate, locational, and compositional—are considered; the source and nature of the variability determine the appropriate type of measure. To illustrate the effects of these measures and expose their inadequacy when improperly applied, the variability of a three-column data set is interpreted under three different suppositions. Geologists need to be aware of the confusion and misleading results that can develop from the use of variance as a measure of variability for locational or compositional data. |
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| Keywords: | Compositional data locational data replicate data statistics taxonomy topography variance |
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