Frequencies for first 10,000 rows of prov1510 variable in pos1993 dataset :

    medical |
     social |
  workers - |
  volunteer |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,978       99.78       99.78
        .05 |          1        0.01       99.79
        .25 |         13        0.13       99.92
         .5 |          2        0.02       99.94
          1 |          2        0.02       99.96
        1.5 |          1        0.01       99.97
          2 |          2        0.02       99.99
          3 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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