I was recently looking at a paper in the journal Psychological Science and came across this:
F(1, 71) = 4.5, p = .037, $\mu^2$ = .06
F(1, 71) = 0.08, p = .78, $\mu^2$ = .001
I was wondering what the $\mu^2$ is in the above. Typically in APA the third thing should be either the MSE or it should be a standardized effect size (or you should have all 4). I'm guessing it's a standardized effect size of some sort but I'm not familiar with it and searching the net has turned up nothing. The actual effect, as near as I can tell from the graph, is about 12 for the first one.
Is this an effect size I haven't heard of yet or a typo in the article?
Farrelly, D., Slater, R., Elliott, H. R., Walden, H. R. and Wetherell, M. A. (2013) Competitors Who Choose to Be Red Have Higher Testosterone Levels. Psychological Science, DOI:10.1177/0956797613482945
Here's a screen shot of the text (p.2)