Frequencies for first 10,000 rows of prov1500 variable in pos1995 dataset :

 physicians |
- volunteer |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,929       99.29       99.29
        .05 |          2        0.02       99.31
         .1 |          3        0.03       99.34
         .2 |          1        0.01       99.35
        .25 |         30        0.30       99.65
         .3 |          2        0.02       99.67
         .5 |          2        0.02       99.69
          1 |         24        0.24       99.93
          2 |          5        0.05       99.98
          5 |          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