Thanks for your blisteringly quick reply, Henrik!
The strange thing is that I tried running car::Anova with a smaller wide-format dataset that I have, (specifying the model as: dataMatrix ~ 1) and being able to get tests for only the specified terms in idesign. However, I was able to get sphericity tests for this dataset with both afex::aov_car and car::Anova (having the data in both long and wide formats). So clearly it is a matter of having too many conditions (or levels of one particular factor?) in the larger dataset for the number of subjects (right?). :\
Good to know I can ignore the tests I am not interested in. I got told off in my thesis defence for doing this and was told to always report the full set of tests, which John Fox also seems to be advocating in your quote. Any idea why?
Thanks for your help!
Andy
