Sample size for true prevalence

Calculates the posterior probability (confidence) of disease freedom (negative predictive value) for a single time period

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`sep` |
population sensitivity for time period (scalar or vector) |

`p.intro` |
probability of introduction for time period (scalar or vector of same length as sep) |

`prior` |
prior probability of freedom before surveillance (scalar or vector of same length as sep) |

`data.frame`

with columns for sep, p.intro, discounted
prior, pfree, pfree.equ and prior.equ

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