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add Dawson & RIchter's (2006) simple slope difference test #31
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Hmm, I'm not sure of a way to build a great interface to this. If my quick analysis and tinkering is correct, a "default" implementation that tests all contrasts with default behavior for everything else (i.e., 3 unique I think it could make more sense not to use every possible contrast and instead look at a more limited set. For instance, Compare the slope when
Such that you're isolating the effect of the second moderator. To have complete coverage of the Then you have "only" 9 comparisons in a standard scenario. But I struggle to think of a decent way to have users request specific comparisons without generating a lot of help requests. I'll give it some thought though and have sketched up some of the internal functions that would be needed to do it. |
I'm not sure if other packages conduct Dawson & Richter's simple slope difference test, I'm only familiar with 'pequod'. That is my baseline. It provides ALL t-tests for 3-way simple slopes with Bonferroni corrections. The presentation is awful, as you predicted it would be. I think the way you implemented Another option could be to give users the option to specify the desired slope comparisons (e.g., [1,1,1, vs 1,2,2]) where users could decide on specifically planned contrasts. The syntax can be simple and easy (similar to the above For output, I think providing a tibble could help improve the readability. Something similar to the output given by the 'parameters' package (https://easystats.github.io/parameters/):
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Could you add a function to provide Dawson & RIchter's (2006) simple slope difference test for three-way interactions? The 'pequod' package has this in its "simpleSlope()" function but that package hasn't been updated in a couple of years.
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