fixed-effect model matrix is rank deficient so dropping 7 columns / coefficients.
Result with add_ci/add_pi
Error in X %*% vcovBetaHat : non-conformable arguments
Likely what is happening is that lmer is taking your specified model, noticing that the covariance matrix won't properly invert, and is thus dropping some columns so that it behaves better. When ciTools tries to do the same thing, it attempts to use the original, un-reduced matrix and thus produces the above error.
I have opened a new branch that addresses this bug. But now I'm wondering if we need to implement similar fixes for lm, glm, etc.
41f3c65d6e257c68dbb68d55cb4eaad3701342a1
Warning message produced by lme4::lmer
Result with add_ci/add_pi
Likely what is happening is that lmer is taking your specified model, noticing that the covariance matrix won't properly invert, and is thus dropping some columns so that it behaves better. When ciTools tries to do the same thing, it attempts to use the original, un-reduced matrix and thus produces the above error.