Frequencies for first 10,000 rows of metal variable in person dataset :

      metal |      Freq.     Percent        Cum.
------------+-----------------------------------
          B |      2,000       20.00       20.00
          C |      2,000       20.00       40.00
          G |      2,000       20.00       60.00
          P |      2,000       20.00       80.00
          S |      2,000       20.00      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 2 May 2016