Frequencies for first 10,000 rows of physn_vlntr_cnt variable in pos2003 dataset :

 physicians |
- volunteer |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,915       99.15       99.15
        .01 |          1        0.01       99.16
        .02 |          2        0.02       99.18
        .05 |          3        0.03       99.21
         .1 |          1        0.01       99.22
         .2 |          2        0.02       99.24
        .25 |         20        0.20       99.44
         .3 |          2        0.02       99.46
         .5 |          3        0.03       99.49
        .75 |          1        0.01       99.50
          1 |         36        0.36       99.86
          2 |          7        0.07       99.93
          3 |          1        0.01       99.94
          5 |          1        0.01       99.95
       5.75 |          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 , 17 May 2017