Frequencies for first 10,000 rows of prov1500 variable in pos1993 dataset :

 physicians |
- volunteer |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,934       99.34       99.34
         .1 |          2        0.02       99.36
         .2 |          2        0.02       99.38
        .25 |         30        0.30       99.68
         .3 |          1        0.01       99.69
         .5 |          4        0.04       99.73
          1 |         19        0.19       99.92
          2 |          3        0.03       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