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The paper Carpinteri et al 2011 J. Stat. Mech. P09009, published 14 September 2011, has been retracted by the Editorial board, following an investigation for self-plagiarism. The investigation has shown that large parts of the paper, including the main analysis, the motivation and the conclusions, are literally copied from the paper Phys. Rev. Lett. 106 108503 published 10 March by the same authors. The Phys. Rev. Lett. paper is cited, but the text copied from it is not quoted. The extra material (one figure and the related analysis) is not sufficient to justify a second publication, and in fact it is not even mentioned in the main discussion and conclusions. The Editorial board considers that the submission of the J. Stat. Mech. paper is in violation of the copyright agreement signed by the authors.