Freedom from Disease
FUNCTION to compute the herd-based alpha-errors (= 1 - herd sensitivit...
FUNCTION to compute the average alpha-error (= error of first kind) fo...
FUNCTION to compute the a-posteriori error.
FUNCTION to compute the a-posteriori error considering a population st...
FUNCTION to compute the optimal sample size.
FUNCTION to compute the optimal sample size for populations stratified...
FUNCTION to compute the probability of finding no testpositives in a s...
FUNCTION to compute the probability of finding no testpositives in a s...
Internal FFD functions
Freedom From Disease sampling plan calculator
Class "IndSampling"
Constructor for class 'IndSampling'.
Class "IndSamplingSummary"
Constructor for class 'IndSamplingSummary'.
List Objects
Class "LtdSampling"
Constructor for class 'LtdSampling'.
Class "LtdSamplingSummary"
Constructor for class 'LtdSamplingSummary'.
Class "SurveyData"
Constructor for class 'SurveyData'.
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, <doi:10.1016/s0167-5877(97)00081-0>). 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, <doi:10.1016/S0167-5877(01)00245-8>). Methods to compute the a-posteriori alpha-error are implemented. Risk-based targeted sampling is supported.
Useful links