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Correlation and Regression
The Correlation Coefficient
-- calculates the linear correlation coefficient.
Two Correlation Coefficients
-- "This is a quite insensitive test to decide whether two correlations have different strengths."
The Rank Correlation Coefficient
-- "The Rank Correlation test is a distribution free test that determines whether there is a monotonic relation between two variables ( x , y )."
-- Allows you to compute the biserial and point-biserial correlations for test score analysis.
Nonlinear Least Squares Curve Fitter
-- "This page lets you fit any function of up to eight parameters to a set of data."
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