On Sample Size Determination When Comparing Two Independent Spearman or Kendall Coefficients

One of the most commonly used statistical methods is bivariate correlation analysis. However, it usually case that little or no attention given to power and sample size considerations when planning a study in which will be primary In fact, we reviewed studies published clinical research journals 2014, found none 111 articles presented results analyses included justification. It sometimes interest compare two coefficients between independent groups. For example, one may wish diabetics non-diabetics terms systolic blood pressure with age. Tools for performing calculations comparison Pearson are widely available; however, were unable identify any easily accessible tools comparing Spearman rank Kendall concordance. this article, provide formulas charts can calculate needed testing hypothesis equal.