abs_dif                 Test for intrapair phenotypic differences based
                        on pair-level predictor variables
env_dif                 Test for intrapair phenotypic differences in an
                        outcome based on intrapair-differences
                        predictor variables
env_dif_logistic        Test for intrapair phenotypic differences in a
                        binary outcome based on intrapair-differences
                        predictor variables
fam_env                 Linear and logistic regression models for
                        familiar and unique environmental factors
flu_weight              Flu, Body Weight and DNA methylation
log_dif                 Test for intrapair logarithm-based phenotypic
                        differences based on pair-level predictor
                        variables
mztwinreg-package       Regression Modeling of MZ Twin Data
