Frequencies for first 10,000 rows of prov2705 variable in pos1992 dataset :

      staff |
   assisted |
   dialysis |
       cert |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,561       95.61       95.61
          A |        298        2.98       98.59
          B |        138        1.38       99.97
          E |          3        0.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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