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1) This experiment was done 5 years ago.
2) It was a very, very limited sample set. 5 sites in the control group and 5 in the experimental group hardly gives any kind of conclusive data.
3) Even if their conclusion were true, this experiment tells you nothing about the magnitude of outbound links as a ranking signal because they used made up words. It was only these 10 sites competing. Outbound links might have a .000001% impact on rankings, but that was all it took for those sites to rank ahead of the other ones.
