Dear all,

I am working on interaction terms between two levels.
But when I plot them with the package languageR and following function,
I could have "impossible" predicted values, which is going beyond
my dependent variable.
My DV ranges 0 to 1 in continuous variable. But lines appear above 1.

lmerPlotInt.fnc(model.after.control.influence, "x", "y", "y:x",
which="matplot", ylabel="DV", ylim=c(0,1.1))

The issue here seems only to appear when I control influence country
by using the package influence.ME. (Actually there is another issue involved
this package like I couldn't plot after using "exclude.influence" function.
In R, it only makes coordinates without any lines. I followed their
recommendation
and regenerate a model that have all the coefficients same except for
influence dummy variable)

When I include influence case(s), I can see those lines within the range of
DV.
Can anyone familiar with lmerPlotInt.fnc let me know what's going on?

And, I wonder if there is another alternative package/function for plotting
interaction terms in mixed effect model using LMER or others.
Thanks much in advance.

-Chang

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