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...iven the purpose of the function? d) fixed intercept, random slope(s) ? wouldn?t make much sense either? Question 2) I know R is sometimes smarter than one would expect after having used other statistical software for years, but? Multilevel Mediations can take in principle three forms (Krull & KacKinnon, 2001; numbers indicate levels): 1->1->1 2->1->1 2->2->1 Is ?sobel.lme? really smart enough to ?notice? that a variable is constant within groups and therefore assigns it to the group level accordingly? If not, it would probably help to know which of the above three mediation-form...