Frequencies for first 10,000 rows of prov2220 variable in pos1991 dataset :

       srv: |
    medical |
     social |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      5,648       56.48       56.48
          0 |        624        6.24       62.72
          1 |      1,600       16.00       78.72
          2 |        519        5.19       83.91
          3 |         54        0.54       84.45
          4 |        756        7.56       92.01
          5 |        500        5.00       97.01
          6 |        195        1.95       98.96
          7 |        104        1.04      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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