Frequencies for first 10,000 rows of physn_vlntr_cnt variable in pos1994 dataset :

 physicians |
- volunteer |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,938       99.38       99.38
        .05 |          2        0.02       99.40
         .1 |          3        0.03       99.43
         .2 |          1        0.01       99.44
        .25 |         26        0.26       99.70
         .3 |          1        0.01       99.71
         .5 |          3        0.03       99.74
          1 |         19        0.19       99.93
          2 |          5        0.05       99.98
          5 |          1        0.01       99.99
         25 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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