| admmSolverGroupSLOPE | Alternating direction method of multipliers | 
| coef.grpSLOPE | Extract model coefficients | 
| getGroupID | Get a groupID object | 
| grpSLOPE | Group SLOPE (Group Sorted L-One Penalized Estimation) | 
| lambdaGroupSLOPE | Regularizing sequence for Group SLOPE | 
| predict.grpSLOPE | Obtain predictions | 
| proxGroupSortedL1 | Prox for group SLOPE | 
| proximalGradientSolverGroupSLOPE | Proximal gradient method for Group SLOPE | 
| prox_sorted_L1 | Prox for sorted L1 norm | 
| sigma | Extract (estimated) noise level | 
| sigma.grpSLOPE | Extract (estimated) noise level | 
| SLOPE_solver | Sorted L1 solver |