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

This function computes the power for a (right tail) test of difference of means

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`N` |
The population size. |

`n` |
The sample size. |

`mu1` |
The value of the estimated mean of the variable of interes for the first population. |

`mu2` |
The value of the estimated mean of the variable of interes for the second population. |

`sigma1` |
The value of the estimated variance of the variable of interes for the first population. |

`sigma2` |
The value of the estimated mean of a variable of interes for the second population. |

`D` |
The value of the null effect. |

`DEFF` |
The design effect of the sample design. By default |

`conf` |
The statistical confidence. By default |

`plot` |
Optionally plot the power achieved for an specific sample size. |

We note that the power is defined as:

*1-Φ(Z_{1-α} - \frac{ (D - (μ_1 - μ_2))}{√{\frac{1}{n}(1-\frac{n}{N})S^2}})*

where

*S^2 = DEFF (σ_1^2 + σ_2^2 *

The power of the test.

Hugo Andres Gutierrez Rojas <hugogutierrez at usantotomas.edu.co>

Gutierrez, H. A. (2009), *Estrategias de muestreo: Diseno de encuestas y estimacion de parametros*. Editorial Universidad Santo Tomas

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samplesize4surveys documentation built on July 24, 2018, 9:04 a.m.

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