Probability of freedom for single time period

Calculates the probability (confidence) of disease freedom for given prior, sep and p.intro over 1 or more time periods

1 | ```
pfree.calc(sep, p.intro, prior = 0.5)
``` |

`sep` |
population sensitivity for each time period (vector) |

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

`prior` |
prior probability of freedom before surveillance (scalar) |

`data.frame`

with columns for sep, p.intro, discounted
prior, probability of freedom, equilibrium probability of freedom
and equilibrium prior

1 2 3 4 5 | ```
# examples for pfree.calc
pfree.calc(0.8, 0.01, 0.5)
pfree.calc(rep(0.6,24), 0.01, 0.5)
pfree.calc(runif(10, 0.4, 0.6), 0.01, 0.5)
pfree.calc(runif(10, 0.4, 0.6), runif(10, 0.005, 0.015), 0.5)
``` |

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