(no subject)

This is very basic, is there a way to specify in lmer function that I would
like to run my grouping variable as a fixed factor only, without reverting
to lm or plm functions. If one does not specify a random variable, one gets
the error message with lmer function; something that is equivalent to the
statement, "index = "grouping variable", model = "within"" with the plm
function.

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