Description Usage Arguments Details Value References

Wald interval with the possibility to adjust according to Agresti, Caffo (2000) for difference in proportions and independent samples. The Agresti-Caffo interval adds 1 to x1 and x2 and adds 2 to n1 and n2.

1 | ```
wald2ci(x1, n1, x2, n2, conf.level, adjust)
``` |

`x1` |
success counts in sample 1 |

`n1` |
sample size in sample 1 |

`x2` |
success counts in sample 2 |

`n2` |
sample size in sample 2 |

`conf.level` |
confidence coefficient |

`adjust` |
option to adjust the Wald interval to the Agresti-Caffo interval for better performance |

If `adjust=AC`

is chosen, the standard Wald interval is modified
to the Agresti-Caffo adjusted CI (American Statistician, 2000)

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. (2002) Categorical Data Analysis. Wiley, 2nd Edition.
Agresti, A., Caffo, B.(2000) Simple and effective confidence intervals
for proportions and difference of proportions result from adding two
successes and two failures. *The American Statistician* 54 (4), 280–288.

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