Does systematic variation improve the reproducibility of animal experiments?

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We thank H. Würbel and H. Richter for making the data used in Richter et al.1 available to us. We thank the members of the Stats Club of Bielefeld University's Evolutionary Biology, Animal Behaviour and Behavioural Biology departments; H. Würbel for discussion; and F. Schurr for helpful comments on an earlier version of this manuscript.

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Correspondence to Rudy M Jonker.

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The authors declare no competing financial interests.

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Jonker, R., Guenther, A., Engqvist, L. et al. Does systematic variation improve the reproducibility of animal experiments?. Nat Methods 10, 373 (2013) doi:10.1038/nmeth.2439

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