Frequencies for first 10,000 rows of physn_vlntr_cnt variable in pos2008 dataset :

 physicians |
- volunteer |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,917       99.17       99.17
        .01 |          1        0.01       99.18
        .02 |          1        0.01       99.19
        .05 |          1        0.01       99.20
         .1 |          1        0.01       99.21
         .2 |          1        0.01       99.22
        .25 |         17        0.17       99.39
         .3 |          1        0.01       99.40
         .5 |          4        0.04       99.44
        .75 |          1        0.01       99.45
          1 |         43        0.43       99.88
        1.5 |          1        0.01       99.89
          2 |          6        0.06       99.95
          4 |          1        0.01       99.96
          5 |          1        0.01       99.97
          7 |          1        0.01       99.98
         20 |          1        0.01       99.99
         24 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 17 May 2017