Frequencies for first 10,000 rows of rn_vlntr_cnt variable in pos2009 dataset :

 REGISTERED |
   NURSES - |
  VOLUNTEER |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,954       99.54       99.54
        .01 |          2        0.02       99.56
         .1 |          1        0.01       99.57
        .13 |          1        0.01       99.58
        .15 |          1        0.01       99.59
         .2 |          1        0.01       99.60
        .25 |          2        0.02       99.62
         .5 |          2        0.02       99.64
        .75 |          1        0.01       99.65
          1 |         18        0.18       99.83
       1.25 |          1        0.01       99.84
        1.5 |          1        0.01       99.85
          2 |          9        0.09       99.94
          3 |          3        0.03       99.97
          4 |          2        0.02       99.99
         15 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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