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Stats Excel Spearman Function

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Description
Excel has a built-in statistical function =CORREL(array1,array2), which works great to correlate two sets of data (Pearson correlation). However, it does not provide a solution for the Spearman correlation (between rank of two sets).
This VBA code is an add-in function you can create such that =SPEARMAN(array1,array2) calculates immediately the Spearman correlation without having to go through the intermediate RANK() calculation columns. You can also use this code as a stand-alone macro (change "function" to "sub").