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
1 |
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 <hagutierrezro at gmail.com>
Gutierrez, H. A. (2009), Estrategias de muestreo: Diseno de encuestas y estimacion de parametros. Editorial Universidad Santo Tomas
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