How much randomness is needed for statistics?

In algorithmic randomness, when one wants to define a randomness notion with respect to some non-computable measure lambda, a choice needs to be made. One approach is to allow randomness tests to access the measure lambda as an oracle (which we call the "classical approach"). The other approach is the opposite one, where the randomness tests are completely effective and do not have access to the information contained in lambda (we call this approach "Hippocratic"). While the Hippocratic approach is in general much more restrictive, there are cases where the two coincide. The first author showed in 2010 that in the particular case where the notion of randomness considered is Martin-Lof randomness and the measure lambda is a Bernoulli measure, classical randomness and Hippocratic randomness coincide. In this paper, we prove that this result no longer holds for other notions of randomness, namely computable randomness and stochasticity. (C) 2014 Elsevier B.V. All rights reserved.