Frequencies for first 10,000 rows of prov2705 variable in pos1995 dataset :

      staff |
   assisted |
   dialysis |
       cert |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,509       95.09       95.09
          A |        380        3.80       98.89
          B |        106        1.06       99.95
          E |          5        0.05      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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