Frequencies for first 10,000 rows of prov2705 variable in pos1993 dataset :

      staff |
   assisted |
   dialysis |
       cert |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,549       95.49       95.49
          A |        332        3.32       98.81
          B |        115        1.15       99.96
          E |          4        0.04      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 26 Jan 2016