Frequencies for first 10,000 rows of prov2220 variable in pos1999 dataset :

       srv: |
    medical |
     social |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,137       81.37       81.37
          0 |        275        2.75       84.12
          1 |      1,095       10.95       95.07
          2 |        361        3.61       98.68
          3 |        132        1.32      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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