将数值变量和分类变量划分为R中的适当范围

 Df <- bball5
 str(bball5)
 'data.frame':  379 obs. of 9 variables:
 $ ID         : int  238 239 240 241 242 243 244 245 246 247 ...
 $ Sex        : Factor w/ 2 levels "female","male": 1 1 1 1 1 1 1 1 1 1 ...
 $ Sport      : Factor w/ 10 levels "BBall","Field",..: 1 1 1 1 1 1 1 1 1 1 
 $ Ht         : num  196 190 178 185 185 ...
 $ Wt         : num  78.9 74.4 69.1 74.9 64.6 63.7 75.2 62.3 66.5 62.9 ...
 $ BMI        : num  20.6 20.7 21.9 21.9 19 ...
 $ BMIc       : NA NA NA NA NA NA NA NA NA NA ...
 $ Sex_f      : Factor w/ 1 level "female": 1 1 1 1 1 1 1 1 1 1 ...
 $ Sex_m      : Factor w/ 1 level "male": NA NA NA NA NA NA NA NA NA NA ...
 Df <- bball5
 str(bball5)
 'data.frame':  379