Estimate sample size to find population proportion with given tolerance

Estimate sample size to find population proportion with given tolerance

required.sample.size(epsilon, pest = 0.5, alpha = 0.05, N = Inf)

Arguments

epsilon	Tolerange of proportion estimate (see details)
pest	The estimated proportion (leave at 0.5 if unknown)
alpha	The confidence interval is (1-alpha)*100%
N	Population size (default implies infinite population)

Value

numeric

Details

Estimated proportion should have (1-alpha)*100% confidence of being within p +/- epsilon of the true proportions

References

See https://onlinecourses.science.psu.edu/stat414/node/264

See also

Other population-sampling: prop.ci, sample_finite_population, truepos_given_sample

Examples

required.sample.size(0.04, alpha=0.1)
#> [1] 422.7412
required.sample.size(0.04, alpha=0.1, N=40)
#> [1] 36.62148
# epsilon here is equivalent to +/- 4
required.sample.size(10/40, alpha=0.1, N=40)
#> [1] 8.68864