Power Calculation for Pearson's & Spearman's Correlation

Sample size is the number of observations in a sample.

Power is the probability of accepting the alternative hyptothesis when it is in fact true.

Correlation is ...

Significance Level is the α value


The highlighted field denotes which variable is calculated.

Correlation coefficient
We use the population correlation coefficient (r) as the effect size measure. Cohen suggests that r values of 0.1, 0.3, and 0.5 represent small, medium and large effect sizes respectively.

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