![]() Since order comes before proc, our contrast coding for the interaction would be the following: Recall that the order of the factors is determined in the mixed command in the SPSS syntax. Any time that the higher-order term includes the contrast, for example, the interaction order * proc** includes the contrast for proc, we need to include the contrast coding of the main effect, namely, the difference between game1 and survey1 in the variable proc. In this model we are exploring the contrast of absolute and ambiguous proclamation when taking into account the interaction between averaged levels of game1 and survey1. Since we are not contrasting the levels of ‘order’, we will code both levels game1 and survey1 as of equal weight, namely, o1 =. ![]() Let’s start with the contrast of the two-levels of ‘proc’ (i.e., absolute and ambiguous) and code it as p1 = -.5 and p2 =.
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