Frequencies for first 10,000 rows of prov2220 variable in pos1994 dataset :

       srv: |
    medical |
     social |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,542       85.42       85.42
          0 |        340        3.40       88.82
          1 |        672        6.72       95.54
          2 |        323        3.23       98.77
          3 |        123        1.23      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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