Frequencies for first 10,000 rows of prov1510 variable in pos2001 dataset :

    medical |
     social |
  workers - |
  volunteer |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,972       99.72       99.72
        .25 |          9        0.09       99.81
         .5 |          3        0.03       99.84
          1 |         14        0.14       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