FFD

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.

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