NPMPM: tertiary probabilistic model in predictive microbiology for use in food manufacture

The main method npmpm calculates bacterial concentrations during food manufacture after a contamination. Variability and uncertainty are included by use of probability distributions and Monte Carlo Simulation. The model aims at predicting possible bacterial concentrations at one certain point in time s, e.g. at the end of a process chain. The process steps of this process chain are run through in linear order. Experimental data that match current process step conditions are gathered, and one deterministic primary model is fitted to every series of measured values. From every fitted curve one concentration of bacteria at time s is computed, yielding a set of concentrations. This sample of possible contamination sizes is assumed to follow a certain probability distribution. After calculation of distribution parameters, one value is randomly drawn from this probability distribution. This value may be modified, and then serves as contamination for the next process step.

Author
Nadine Schoene
Date of publication
2012-10-29 08:57:20
Maintainer
Nadine Schoene <nadine.schoene@fu-berlin.de>
License
GPL (>= 2)
Version
1.0

View on CRAN

Man pages

allneded
loads all packages this package depends on
apsomv
function that selects the series of measured values
cfuinterpolation
interpolation method
makepdfoutput
generates a .pdf file with information about simulation...
npmpm
main method of the package NPMPM
NPMPM-package
tertiary probabilistic model in predictive microbiology for...
numberiterations
stop criterion
onestep
calculates the bacterial count at the end of a process step
psteppar
function that returns one process step duration

Files in this package

NPMPM
NPMPM/NAMESPACE
NPMPM/man
NPMPM/man/psteppar.Rd
NPMPM/man/npmpm.Rd
NPMPM/man/onestep.Rd
NPMPM/man/apsomv.Rd
NPMPM/man/allneded.Rd
NPMPM/man/cfuinterpolation.Rd
NPMPM/man/makepdfoutput.Rd
NPMPM/man/NPMPM-package.Rd
NPMPM/man/numberiterations.Rd
NPMPM/inst
NPMPM/inst/pdfoutput.Snw
NPMPM/DESCRIPTION
NPMPM/MD5
NPMPM/R
NPMPM/R/numberiterations.R
NPMPM/R/makepdfoutput.R
NPMPM/R/npmpm.R
NPMPM/R/allsomv.R
NPMPM/R/allneded.R
NPMPM/R/simpleinterpolation.R
NPMPM/R/disconestep.R
NPMPM/R/psteppar.R
NPMPM/R/cfuinterpolation.R
NPMPM/R/onestep.R
NPMPM/R/apsomv.R