| mztwinreg-package | Regression Modeling of MZ Twin Data |
| 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 | Regression Modeling of MZ Twin Data |