aging                   Residual DNA-methylation-based (DNAm)
                        gestational age
beta_v_indices          Indices for random beta values
bmiq_norm_450k          Normalize DNA methylation values
download_beta_values_case
                        Access Beta values at individual CpG sites for
                        case group
download_beta_values_control
                        Access Beta values at individual CpG sites for
                        control group
ga                      Gestational age for both case and control
                        groups
ipla                    Identify placental aging
phenotype               Phenotype for both case and control groups
plec                    Estimate DNA-methylation-based gestational age
plec_int_coef           Intercept and coefficients of placental
                        epigenetic clock
plec_scaler_mean        Mean values of the scalers of placental
                        epigenetic clock
plec_scaler_scale       Scale values of the scalers of placental
                        epigenetic clock
probe_info_450k         Probe info for 450K
qc                      Perform quality control
