Frequencies for first 10,000 rows of prov2220 variable in pos1993 dataset :

       srv: |
    medical |
     social |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,638       86.38       86.38
          0 |        338        3.38       89.76
          1 |        614        6.14       95.90
          2 |        321        3.21       99.11
          3 |         89        0.89      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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