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FFD (version 1.0-6)

Freedom from Disease

Description

Functions, S4 classes/methods and a graphical user interface (GUI) to design surveys to substantiate freedom from disease using a modified hypergeometric function (see Cameron and Baldock, 1997). Herd sensitivities are computed according to sampling strategies "individual sampling" or "limited sampling" (see M. Ziller, T. Selhorst, J. Teuffert, M. Kramer and H. Schlueter, 2002). Methods to compute the a-posteriori alpha-error are implemented. Risk-based targeted sampling is supported.

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Version

Install

install.packages('FFD')

Monthly Downloads

223

Version

1.0-6

License

GPL (>= 2)

Maintainer

Ian Kopacka

Last Published

February 24th, 2015

Functions in FFD (1.0-6)

computeAlpha

FUNCTION to compute the herd-based alpha-errors (= 1 - herd sensitivity).
FFD-internal

Internal FFD functions
computeOptimalSampleSize

FUNCTION to compute the optimal sample size.
FFD_GUI

Freedom From Disease sampling plan calculator
computePValueRiskGroups

FUNCTION to compute the probability of finding no testpositives in a sample of a certain size for a population stratified into risk groups.
computeAlphaLimitedSampling

FUNCTION to compute the average alpha-error (= error of first kind) for limited sampling.
computeAposterioriError

FUNCTION to compute the a-posteriori error.
computeOptimalSampleSizeRiskGroups

FUNCTION to compute the optimal sample size for populations stratified by risk factors.
computeAposterioriErrorRiskGroups

FUNCTION to compute the a-posteriori error considering a population stratified into risk geroups.
computePValue

FUNCTION to compute the probability of finding no testpositives in a sample of a certain size.
lls

List Objects
IndSampling-class

Class "IndSampling"
LtdSamplingSummary-class

Class "LtdSamplingSummary"
indSamplingSummary

Constructor for class 'IndSamplingSummary'.
ltdSampling

Constructor for class 'LtdSampling'.
indSampling

Constructor for class 'IndSampling'.
LtdSampling-class

Class "LtdSampling"
IndSamplingSummary-class

Class "IndSamplingSummary"
ltdSamplingSummary

Constructor for class 'LtdSamplingSummary'.
sheepData

Simulated test data frame of Austrian sheep holdings.
SurveyData-class

Class "SurveyData"
surveyData

Constructor for class 'SurveyData'.