Problems Associated with Planning BOD Experiments

by Paul M. Berthouex, (A.M.ASCE), Res. Engr.; Gesellschaft fuer Klaeranlagen and Wasserversorgung, Mannheim mbH, Mannheim, W. Germany,
William G. Hunter, Prof. of Statistics and Engrg.; Univ. of Wisconsin, Madison, WI,

Serial Information: Journal of the Sanitary Engineering Division, 1971, Vol. 97, Issue 3, Pg. 333-344

Document Type: Journal Paper


Possible inadequacies of commonly used long-term BOD experimental strategies are studied using actual BOD data and the first-order reaction model as a vehicle of analysis. The relation between the times and numbers of observations and the statistical quality of the estimated parameters k and La is shown, where statistical quality is measured by the size of the joint confidence region and the degree of parameter correlation. Merely making a large number of observations does not necessarily ensure that precise parameter estimates will be obtained. On the other hand, if the observations are efficiently located a small number of observations can give precise parameter estimates.

Subject Headings: Parameters (statistics) | Quality control | Joints | Correlation

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