| deleting_wrongeffect | check monotonicity of marginal impacts and re-estimate the model. |
| effect | evaluate the marginal effects of the selected raw variable on the dependent. |
| Enter_to_Continue | Enter_to_Continue: wait your response to continue |
| focusing_var_coeff | focusing on selected variables in the model, and eliminating impacts from other variables. |
| get_contrast | get contrast of categorical variables in a model |
| get_model_pair | get a list of model vars with their corresponding coeff vars or raw vars. |
| get_model_with_coeff | get a list of model variables with their corresponding coeff vars. |
| get_model_with_raw | get a list of model vars with their corresponding raw vars. |
| get_valid_rows | identify missing rows for model/formula. |
| get_x | get x (left hand of var) from model or formula |
| get_x_all | a unique combinations of model vars, coeff vars and raw vars |
| get_y | get y (right hand of var) |
| paste_formula | paste a formula as string |
| stepwise2 | same as 'step()' in R, but able to check marginal effects. |