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Using the Fisher rtoz transformation, this page will calculate a value of z that can be applied to assess the significance of the difference between two correlation coefficients, r_a and r_b, found in two independent...
Using the Fisher rtoz transformation, this page will calculate a value of z that can be applied to assess the significance of the difference between r, the correlation observed within a sample of size n and rho, the...
To assess the significance of any particular instance of r, enter the values of N[>6] and r into the designated cells, then click the 'Calculate' button. Application of this formula to any particular observed sample...
This site, created by author David M. Lane of HyperStat Online, defines power and explains what factors may affect it, such as significance level, sample size and variance. In addition, their is an activity allowing...
This page will perform the procedure for up to k=12 sample values of r, with a minimum of k=2. It will also perform a chisquare test for the homogeneity of the k values of r, with df=k1. The several values of r can be...

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