Frequencies for first 10,000 rows of physn_vlntr_cnt variable in pos2007 dataset :

 physicians |
- volunteer |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,914       99.14       99.14
        .01 |          1        0.01       99.15
        .02 |          1        0.01       99.16
        .05 |          2        0.02       99.18
         .1 |          1        0.01       99.19
         .2 |          1        0.01       99.20
        .25 |         18        0.18       99.38
         .3 |          2        0.02       99.40
         .5 |          3        0.03       99.43
        .75 |          1        0.01       99.44
          1 |         43        0.43       99.87
        1.5 |          1        0.01       99.88
          2 |          7        0.07       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