Frequencies for first 10,000 rows of prov2220 variable in pos2004 dataset :

       srv: |
    medical |
     social |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      7,863       78.63       78.63
          0 |        304        3.04       81.67
          1 |      1,204       12.04       93.71
          2 |        366        3.66       97.37
          3 |        263        2.63      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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