Calculate Spearman's Rank Correlation Coefficient

Posted by Arvigeus on Stack Overflow See other posts from Stack Overflow or by Arvigeus
Published on 2014-06-06T15:13:56Z Indexed on 2014/06/06 15:24 UTC
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I'm trying to calculate correlations using this method.

However, when I do the math by hand, I get one result, and when I do it with R - cor(dt, use="complete.obs", method="spearman") - I get totally different thing.

Example data below:

---------------------------------
AnswerPosID.1007 AnswerPosID.1008
---------------------------------
               1                1
               1                1
               1                1
               1                1
               1                1
               1                1
               1                1
               1                1
               1                1
               1                1
               1                1
               1                1
               1                1
               1                1
               1                2
               1                2
               1                1
               1                1
               1                1
               1                1
               2                1
               2                1
               1                1
               1                1
               1                1
               1                1
               1                1
               1                1
               1                1
               1                1
---------------------------------

Manual result: 0.799777530589544;

R cor: -0.07142857

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