lmertest and confidence intervals

Question

Is there a way to get lmertest to produce confidence intervals?

I have tried using this code from https://cran.r-project.org/web/packages/lmerTest/lmerTest.pdf

contest(mymodel , L, rhs = 0, joint = TRUE,
        collect = TRUE, confint = TRUE, level = 0.95,
        check_estimability = FALSE, ddf = c("Satterthwaite", "Kenward-Roger",
                                            "lme4"), ...)

But I get this error

Error in contest(mymodel, L, rhs = 0, joint = TRUE, collect = TRUE, confint = 
TRUE,  : 
  could not find function "contest"

Answer 1

I am not sure why I received errors using the contest function above. I reloaded the package and re-ran my script but still got this error:

Error: '...' used in an incorrect context

However, there is a simple solution to obtain the confidence intervals within the lme4 package:

CI <- confint (mymodel)