size.ci.spear {statpsych} | R Documentation |
Computes the sample size required to estimate a population Spearman correlation with desired confidence interval precision. Set the correlation planning value to the smallest absolute value within a plausible range for a conservatively large sample size.
size.ci.spear(alpha, cor, w)
alpha |
alpha level for 1-alpha confidence |
cor |
planning value of Spearman correlation |
w |
desired confidence interval width |
Returns the required sample size
Bonett DG, Wright TA (2000). “Sample size requirements for estimating Pearson, Kendall and Spearman correlations.” Psychometrika, 65(1), 23–28. ISSN 0033-3123, doi:10.1007/BF02294183.
size.ci.spear(.05, .362, .25)
# Should return:
# Sample size
# 200