Frequencies for first 10,000 rows of prov1500 variable in pos1991 dataset :

 physicians |
- volunteer |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,942       99.42       99.42
        .05 |          3        0.03       99.45
         .2 |          1        0.01       99.46
        .25 |         26        0.26       99.72
         .5 |          2        0.02       99.74
          1 |         17        0.17       99.91
          2 |          4        0.04       99.95
          4 |          2        0.02       99.97
          5 |          1        0.01       99.98
       6.75 |          1        0.01       99.99
         25 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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