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Efficient design of experiments in the Monod model

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Estimation and experimental design in a non-linear regression model that is used in microbiology are studied. The Monod model is defined implicitly by a differential equation and has numerous applications in microbial growth kinetics, water research, pharmacokinetics and plant physiology. It is proved that least squares estimates are asymptotically unbiased and normally distributed. The asymptotic covariance matrix of the estimator is the basis for the construction of efficient designs of experiments. In particular locally D-, E- and c-optimal designs are determined and their properties are studied theoretically and by simulation. If certain intervals for the non-linear parameters can be specified, locally optimal designs can be constructed which are robust with respect to a misspecification of the initial parameters and which allow efficient parameter estimation. Parameter variances can be decreased by a factor of 2 by simply sampling at optimal times during the experiment.

Keywords: D-optimality; E-optimality; Least squares estimate; Locally optimal designs; Microbial growth kinetics; Monod model; c-optimality

Document Type: Research Article


Affiliations: 1: Ruhr-Universit├Ąt Bochum, Germany 2: St Petersburg State University, Russia 3: Stevens Institute of Technology, Hoboken, USA

Publication date: August 1, 2003


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