Frequencies for first 10,000 rows of prov1500 variable in pos2004 dataset :

 physicians |
- volunteer |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,918       99.18       99.18
        .01 |          1        0.01       99.19
        .02 |          2        0.02       99.21
        .05 |          3        0.03       99.24
         .1 |          1        0.01       99.25
         .2 |          1        0.01       99.26
        .25 |         17        0.17       99.43
         .3 |          2        0.02       99.45
         .5 |          3        0.03       99.48
        .75 |          1        0.01       99.49
          1 |         37        0.37       99.86
          2 |          7        0.07       99.93
          3 |          1        0.01       99.94
          4 |          1        0.01       99.95
          5 |          1        0.01       99.96
          7 |          1        0.01       99.97
         20 |          1        0.01       99.98
         24 |          1        0.01       99.99
         60 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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