dat                     A data frame contains dependent variable and
                        continuous independent variables
glm.best                Title: Fitting generalized linear models for
                        the best model
glmdat                  A data frame contains dependent variable and
                        binary independent variables
lm.best                 Title: Fitting linear models for the best model
modelselect.glm         Title: Variable selection for generalized
                        linear models
modelselect.lm          Title: Variable selection for linear models
