nProp | R Documentation |

Compute the simple random sample size for estimating a proportion based on different precision requirements.

nProp(CV0 = NULL, V0 = NULL, pU = NULL, N = Inf)

`CV0` |
target value of coefficient of variation of the estimated proportion |

`V0` |
target value of variance of the estimated proportion |

`pU` |
population proportion |

`N` |
number of units in finite population |

The precision requirement of *p_s* can be set based on either a target coefficient of variation,
*CV_0*, or a target variance, *V_0*. In either case, a value of *p_U* must be supplied.

numeric sample size

Richard Valliant, Jill A. Dever, Frauke Kreuter

Valliant, R., Dever, J., Kreuter, F. (2018, chap. 3). *Practical Tools for Designing and Weighting Survey Samples, 2nd edition*. New York: Springer.

`nCont`

, `nLogOdds`

, `nPropMoe`

, `nWilson`

# srs sample size so that CV of estimated proportion is 0.05 # assuming the population is large and pU=0.01 # Both examples below are equivalent nProp(V0=0.0005^2, N=Inf, pU=0.01) #or nProp(CV0=0.05, N=Inf, pU=0.01) # srswor sample size so that half-width of 2-sided 95% CI is 0.005 nProp(V0=(0.005/1.96)^2, N=Inf, pU=0.01)

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