Frequencies for first 10,000 rows of physn_vlntr_cnt variable in pos2010 dataset :

 PHYSICIANS |
- VOLUNTEER |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,927       99.27       99.27
        .01 |          1        0.01       99.28
        .02 |          1        0.01       99.29
        .05 |          1        0.01       99.30
         .1 |          1        0.01       99.31
         .2 |          1        0.01       99.32
        .25 |         14        0.14       99.46
         .3 |          1        0.01       99.47
         .5 |          3        0.03       99.50
          1 |         40        0.40       99.90
          2 |          7        0.07       99.97
          4 |          1        0.01       99.98
          7 |          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