metan (version 1.2.1)

corr_ss: Sample size planning for a desired Pearson's correlation confidence interval

Description

Find the required (sufficient) sample size for computing a Pearson correlation coefficient with a desired confidence interval (Olivoto et al., 2018).

Usage

corr_ss(r, CI, verbose = TRUE)

Arguments

r

The magnitude of the correlation coefficient.

CI

The half-width for confidence interval at p < 0.05.

verbose

Logical argument. If verbose = FALSE the code is run silently.

Details

The required (sufficient) sample size is computed as follows: $$n = [CI_w/ 0.45304^r \times 2.25152]^{-0.50089}$$

where \(CI_w\) is desired confidence interval and r is the correlation coefficient.

References

Olivoto, T., A.D.C. Lucio, V.Q. Souza, M. Nardino, M.I. Diel, B.G. Sari, D.. K. Krysczun, D. Meira, and C. Meier. 2018. Confidence interval width for Pearson's correlation coefficient: a Gaussian-independent estimator based on sample size and strength of association. Agron. J. 110:1-8. 10.2134/agronj2016.04.0196

Examples

Run this code
# NOT RUN {

corr_ss(r = 0.60, CI = 0.1)


# }

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