MatSqrtInverse          Compute the inverse square root of a matrix
clustSE                 Cluster robust standard errors with degrees of
                        freedom adjustments (for lm and glm objects)
crct                    Simulated data from 18 schools (from a cluster
                        randomized controlled trial)
getV                    Get V matrix for merMod objects
glance.CR2              Glance at goodness-of-fit statistics
gpadat                  Grade point average (GPA) data of students from
                        25 schools
ncvMLM                  Testing for nonconstant variance (ncv)
robust_mixed            Cluster robust standard errors with degrees of
                        freedom adjustments for lmerMod/lme objects
satdf                   Compute Satterthwaite degrees of freedom
sch25                   Data from 25 schools (based on the NELS
                        dataset)
sharedat                Data from Project SHARE
tidy.CR2                Tidy a CR2 object
