Not the test set in Rosetta Code. The part of the test set that people have actu...

		btilly on Nov 14, 2012 \| parent \| context \| favorite \| on: Code Length Measured in 14 Languages Not the test set in Rosetta Code. The part of the test set that people have actually provided Mathematica solutions for. There is every reason to believe that people are more likely to provide Mathematica solutions for problems that Mathematica is likely to be good at.

This is a potential bias that he does call out in the article.