bg_variability          Inpatient blood glucose data for 1200 patients
compile_est             Inpernal function: generate commonly used
                        summary statistics for estimates.
cprobit                 Apply the three-step workflow for the analysis
                        of two repeated outcomes from each subject
cprobit_step1           Inpernal function: step 1 of the proposed
                        workflow
estimate_sd_error       Inpernal function: estimate the SD of error
                        terms in the difference model
geom_mean               Inpernal function: compute geometric mean of a
                        positive variable
get_v                   Inpernal function: compute difference in the
                        (transformed) outcome
make_design_mat         Inpernal function: construct design matrix
                        without the intercept term.
profile_llh             Inpernal function: profile log-likelihood of
                        lambda
update_estimate         Inpernal function: update Step 1 estimates to
                        obtain linear exposure effect on (transformed)
                        outcome
