Dear R list members,

I'd like to make a graph of coefficients of the intercept, variable 1, and
variable 2 (and possibly the interaction between variable 1 and variable
2).  When I use the lmList function as attached below, it shows a nice
coefficient graph.

> PACRP.lis <- lmList(PAffect ~ CRPC + CRPT + CINT | ID, redinteract)
> coef(PACRP.lis)
> PACRPlis.coef <- coef(PACRP.lis)
> plot(PACRPlis.coef)



However, when I'd like to make a graph using the lmer function, it shows the
error message below.

> PACRP <- lmer(PAffect ~ CRPC + CRPT + CINT + (1 + CRPC + CRPT + CINT |ID),
redinteract)
> coef(PACRP)
> PACRP.coef <- coef(PACRP)
> plot(PACRP.coef)
*Error in eval(expr, envir, enclos) : object ".grp" not found
*

Does it mean that I cannot make a graph using the lmer function?  Or, do I
need to install another package?  I'd greatly appreciate if someone could
give me suggestions.


Thank you so much for your help in advance,
Sachi

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