Computes the root-mean-squared error (RMSE) of the difference between observed values and the predicted values or the RMSE or relative percent differences (RPD) between samples and duplicates.
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either a random vector an object for which a method exists.
arguments to be passed to or from methods.
duplicate samples paired with
Added from smwrStats.
rmse functions, a single value representing the
estimated RMSE. For
rpd, the relative percent differences for each
paired sample and duplicate.
The definition for the RMSE of paired water-quality duplicates is
RMSE = sqrt(sum of squared differences/2 times the number of duplicates)
The definition for RPD for paired water-quality duplicates is
RPD = abs(x - y)/(x + y)/2 * 100
Other disciplines may use different equations.
Bland J.M. and Altman D.G., 1986 Statistical methods for assessing agreement
between two methods of clinical measurement: Lancet, i, p. 307–310.
Clesceri, L.S., Greenberg, A.E., and Eaton, A.D., 1998, Standard
methods for the examination of water and wastewater, 20th edition:
Baltimore, Md, United Book Press, Inc., 1162 p.
Harvey, D., undated, Analytical chemistry 2.0: Analytical Sciences Digital Library: online at URL: http://www.asdlib.org/onlineArticles/ecourseware/Analytical
Helsel, D.R., and Hirsch, R.M., 2002, Statistical methods in water
resources: U.S. Geological Survey Techniques of Water-Resources
Investigations, book 4, chap. A3, 522 p.
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