Adjusted Wald interval for a difference of proportions with matched pairs. This is the interval called Wald+2 in Agresti and Min (2005). Adds 0.5 to each cell before constructing the Wald CI

1 | ```
diffpropci.mp(b, c, n, conf.level)
``` |

`b` |
off-diag count |

`c` |
off-diag count |

`n` |
sample size |

`conf.level` |
confidence coefficient |

The interval is truncated, when it overshoots the boundary

A list with class '"htest"' containing the following components:

`conf.int ` |
a confidence interval for the difference in proportions. |

`estimate ` |
estimated difference in proportions |

Agresti, A. and Min, Y. (2005) Simple improved confidence intervals for
comparing matched proportions. *Statistics in Medicine* 24 (5), 729–740.

1 | ```
diffpropci.mp(b = 40, c = 20, n = 160, conf.level = 0.95)
``` |

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