Frequencies for first 10,000 rows of prov1510 variable in pos1991 dataset :

    medical |
     social |
  workers - |
  volunteer |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,972       99.72       99.72
         .2 |          1        0.01       99.73
        .25 |         13        0.13       99.86
         .5 |          2        0.02       99.88
          1 |          7        0.07       99.95
        1.5 |          1        0.01       99.96
          2 |          3        0.03       99.99
         10 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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