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  1. The "Most Probable Number" estimate and its confidence limits.

    Article - En anglais

    The dilution method is used to obtain an indirect count of microorganisms, e.g. fecal bacteria commonly used as human contamination indicators, in a suspension.

    The Most Probable Number estimate provides a quantification of dilution method results.

    This estimate is commonly obtained by using Poisson distribution.

    Although the use of binomial distribution leads to lower estimates, only a 5% maximum difference was noted, which is negligible in terms of MPN precision.

    Relative MPN bias is considerable (35% on average) and apparently varies with true bacterial density; however the binomial model reduces its magnitude by 5-8%. A new method for determining Bayesian intervals based on an equilikelihood criterion is presented.

    Mots-clés Pascal : Qualité eau, Coliforme, Feces, Pollution eau, Indicateur biologique, Limite confiance, Loi Poisson, Nombre le plus probable

    Mots-clés Pascal anglais : Water quality, Coliforms, Feces, Water pollution, Biological indicator, Confidence limit, Poisson distribution

    Logo du centre Notice produite par :
    Inist-CNRS - Institut de l'Information Scientifique et Technique

    Cote : 93-0397572

    Code Inist : 001D16A02. Création : 199406.