Description Usage Arguments Value Author(s) References See Also Examples

Calculate an estimated sample size to do a trinomial bound that would have a specified power (the chance to certify assuming a given estimate of low-error error rate), and a specified maximum risk of erroneously certifying if the actual election outcome is wrong.

1 2 3 | ```
tri.calc.sample(Z, beta = 0.75, guess.N = 20,
p_d = 0.1, swing = 5, power = 0.9,
bound = c("e.plus", "WPM", "passed"))
``` |

`Z` |
elec.data object |

`beta` |
1-beta is the acceptable risk of failing to notice that a full manual count is needed given an election with an actual outcome different from the semi-official outcome. |

`guess.N` |
The guessed needed sample size. |

`p_d` |
For the alternate: estimate of the proportion of precincts that have error. |

`swing` |
For the alternate: estimate of the max size of an error in votes, given that error exists. |

`power` |
The desired power of the test against the specified alternate defined by p\_d and swing. |

`bound` |
e.plus, WPM, or use the passed, previously computed, e.max values in the Z object. |

An `audit.plan.tri`

object. This is an object that holds information on
how many samples are needed in the audit, the maximum amount of
potential overstatement in the election, and a few other things.

Luke W. Miratrix

See Luke W. Miratrix and Philip B. Stark. (2009) Election Audits using a Trinomial Bound. http://www.stat.berkeley.edu/~stark

See `elec.data`

for information on the object that holds
vote counts. See
`tri.sample`

for drawing the actual sample. See
`audit.plan.tri`

for theo object that holds the audit plan
information (e.g., number of draws, estimated work in ballots to
audit, etc.). See `trinomial.bound`

for analyzing the
data once the audit results are in. See `tri.audit.sim`

for simulating audits using this method. See CAST for an SRS audit method.

1 2 3 4 | ```
data(santa.cruz)
Z = elec.data( santa.cruz, C.names=c("danner","leopold") )
tri.calc.sample( Z, beta=0.75, guess.N = 10, p_d = 0.05,
swing=10, power=0.9, bound="e.plus" )
``` |

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