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Sensitivity analysis of microbial growth parameter distributions with respect to data quality and quantity by using Monte Carlo analysis

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  • Poschet, F.
  • Bernaerts, K.
  • Geeraerd, A.H.
  • Scheerlinck, N.
  • Nicolaı̈, B.M.
  • Van Impe, J.F.

Abstract

Nowadays, most of the mathematical models used in predictive microbiology are deterministic, i.e. their model output is only one single value for the microbial load at a certain time instant. For more advanced exploitation of predictive microbiology in the context of hazard analysis and critical control points (HACCP) and risk analysis studies, stochastic models should be developed. Such models predict a probability mass function for the microbial load at a certain time instant. An excellent method to deal with stochastic variables is Monte Carlo analysis. In this research, the sensitivity of microbial growth model parameter distributions with respect to data quality and quantity is investigated using Monte Carlo analysis. The proposed approach is illustrated with experimental growth data. There appears to be a linear relation between data quality (expressed by means of the standard deviation of the normal distribution assumed on experimental data) and model parameter uncertainty (expressed by means of the standard deviation of the model parameter distribution). The quantity of data (expressed by means of the number of experimental data points) as well as the positioning of these data in time have a substantial influence on model parameter uncertainty. This has implications for optimal experiment design.

Suggested Citation

  • Poschet, F. & Bernaerts, K. & Geeraerd, A.H. & Scheerlinck, N. & Nicolaı̈, B.M. & Van Impe, J.F., 2004. "Sensitivity analysis of microbial growth parameter distributions with respect to data quality and quantity by using Monte Carlo analysis," Mathematics and Computers in Simulation (MATCOM), Elsevier, vol. 65(3), pages 231-243.
    • Handle: RePEc:eee:matcom:v:65:y:2004:i:3:p:231-243
    DOI: 10.1016/j.matcom.2003.12.002
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    References listed on IDEAS

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    1. Nicolaï, B.M. & Van Impe, J.F., 1996. "Predictive food microbiology: A probabilistic approach," Mathematics and Computers in Simulation (MATCOM), Elsevier, vol. 42(2), pages 287-292.
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    Cited by:

    1. Feng, Xinlong & He, Guoliang & Abdurishit,, 2008. "Estimation of parameters of the Makeham distribution using the least squares method," Mathematics and Computers in Simulation (MATCOM), Elsevier, vol. 77(1), pages 34-44.

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