Hi all,

I have a data set that includes 1 predictor variable (ambient noise) that
is continuous and 2 predictor variables that are factors.  One of the
predictor variables has 12 levels, that has 59 individuals (random effect)
grouped within (unevenly).  The question is, should I consider mean
centering my continuous predictor variable?  I know that interpretation of
the model results means that the intercept and slope are based on ambient
noise of 0 dB.  If I do want to mean center my data, is there a specific
way I should do this because of the predictor variable that has individuals
grouped within?  Thank you for your help.

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