WereKitten on 03 October 2009
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theRepublic said: ... The raw data can be used as random variables, but market share percentage cannot. The reason for that is because market share percentage is directly dependent on the sales of the other consoles. ... |
Absolutely correct. By using shares you are introducing yourself a negative correlation in your choice of variables.
You would come up with negative correlations even if you considered the "marketshare" of three totally random functions. Try it on Excel, OP
