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I've been helping a friend with his stats homework. We are now working on Pearson's Correlation, whose calculation is done by a rigorously constructing a table of $x$, $y$, $(x_i-\overline{x})$, $(y_i-\overline{y})$, $(x_i-\overline{x})^2$, $(y_i-\overline{y})^2$, $\sum{(x_i-\overline{x})(y_i-\overline{y})}$ and summing the data to the final formula.

There are quite a few Pearson calculators online (e.g. Woflram's), but they all provide a final numeric answer. Is there an online calculator that provides a detailed calculation as well?

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One thing I do in situations like this is use Excel. Then you can lay out the calculations explicitly, each step in its own column. This makes it easy to see what's going on. –  gung Jan 22 '13 at 16:32

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