Frequencies for first 10,000 rows of prov1510 variable in pos1998 dataset :

    medical |
     social |
  workers - |
  volunteer |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,958       99.58       99.58
        .05 |          1        0.01       99.59
        .25 |         14        0.14       99.73
         .5 |          4        0.04       99.77
          1 |         19        0.19       99.96
          2 |          3        0.03       99.99
          3 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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