Frequencies for first 10,000 rows of prov2220 variable in pos1997 dataset :

       srv: |
    medical |
     social |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,199       81.99       81.99
          0 |        281        2.81       84.80
          1 |      1,057       10.57       95.37
          2 |        337        3.37       98.74
          3 |        126        1.26      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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