Dear R users,

Using R lme function, I found that both fixed and random effects of variable
A on variable B are significant.  Now, I'd like to analyze what variables
are predicting differences in the slope.  In other words, I'd like to know
what variables (e.g., variable C) are predicting individual differences in
the effects of A on B.  I have many data points for A and B for each
individual, whereas I have only one data point for C.
I'd appreciate if anyone could answer the question.

Thank you for your attention.

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