Enter_to_Continue       Enter_to_Continue: wait your response to
                        continue
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.
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.
