| coef.sgp | Coefficients from an SGP model | 
| coef.sgp.cv | Coefficients from SGP models | 
| get.loss | A function that calculates the loss/cost | 
| plot.sgp | Plots the coefficient path of an SGP object | 
| plot.sgp.cv | Plots the cross-validation curve from a SGP object | 
| predict.sgp | Predictions based on a SGP model | 
| predict.sgp.cv | Predictions based on a SGP models | 
| process.group | Process groupings for a sparse group penalty | 
| process.lambda | Set up a lambda sequence | 
| process.penalty | Process the arguments about the sparse group penalty | 
| process.X | Process X for a sparse group penalty | 
| process.y | Process y for a sparse group penalty | 
| process.Z | Process Z for a sparse group penalty | 
| sgp | Fit a sparse group regularized regression path | 
| sgp.cv | Cross-validation for sparse group penalties |