Frequencies for first 10,000 rows of prov1510 variable in pos2002 dataset :

    medical |
     social |
  workers - |
  volunteer |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,973       99.73       99.73
        .25 |          7        0.07       99.80
         .5 |          3        0.03       99.83
          1 |         15        0.15       99.98
          2 |          1        0.01       99.99
          3 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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