[R] Contrasts in mixed effects model: difference between differences

(Sorry about the double post; it seems the last time I posted this it didn't show up correctly because of some character encoding issue.) Hello everyone, I am testing a model in which I have a two-level factor (let's call it First [1, 2]) nested under a four-level factor (let's call it Second [A,

[R] Contrasts in mixed effects model: difference between differences

Hello everyone, I am testing a model in which I have a two-level factor (let's call it First [1, 2]) nested under a four-level factor (let's call it Second [A, B, C, D]). I have used the following model to get coefficients representing whether, for each level of Second, there is a significant diff