| springer-package | Sparse Group Variable Selection for Gene-Environment Interactions in the Longitudinal Study |
| cv.springer | k-folds cross-validation for springer |
| dat | simulated data for demonstrating the usage of springer |
| dmcp | The first order derivative function of MCP (Minimax Concave Penalty) |
| penalty | This function provides the penalty functions. Users can choose one of the three penalties: sparse group MCP, group MCP and MCP. |
| print.springer | print a springer result |
| reformat | This function changes the format of the longitudinal data from wide format to long format |
| springer | fit the model with given tuning parameters |