Trend analysis (NHST) in JASP
I was wondering about how JASP calculates the trends (linear, quadratic, etc.) when asking for polynomial contrasts in an ANOVA (NHST). Is there any reason why it reports the results in a t test rather than in an F test (like SPSS). I guess ultimately the result should be identical when taking the square root of values from the F test, but I do wonder whether there are some crucial differences. I assume that they still are basically simple regression analyses? In this regard, it would also be handy to not only see t and p values but also the dfs for that analysis.
More generally, is there somewhere a documentation on the tests that JASP uses and whether certain corrections have been applied (e.g. I am thinking about the multiple corrections of Cousineau and Morey when it comes to the calculation of within-subject confidence intervals)?