Frequencies for first 10,000 rows of prov1510 variable in pos1999 dataset :

    medical |
     social |
  workers - |
  volunteer |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,969       99.69       99.69
        .05 |          1        0.01       99.70
        .25 |         10        0.10       99.80
         .5 |          4        0.04       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