ramen and pickles

science, technology, and medicine served up with some tasty noodles

Erroneous analyses of interactions in neuroscience: a problem of significance

Just because one treatment is significant and another is not, does NOT mean they are significantly different from each other!  Very common mistakes in calling significance across multiple conditions.

http://dl.dropbox.com/u/1018886/Temp/NieuwenhuisEtAl2011.pdf

“In theory, a comparison of two experimental effects requires a statistical test on their difference. In practice, this comparison is often based on an incorrect procedure involving two separate tests in which researchers conclude that effects differ when one effect is significant (P < 0.05) but the other
is not (P > 0.05). We reviewed 513 behavioral, systems and cognitive neuroscience articles in five top-ranking journals (Science, Nature, Nature Neuroscience, Neuron and The Journal of Neuroscience) and found that 78 used the correct procedure and 79 used the incorrect procedure. An additional analysis suggests that incorrect analyses of interactions are even more common in cellular and molecular neuroscience. We discuss scenarios in which the erroneous procedure is particularly beguiling.”

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