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

LPNS/LVNS - |
  VOLUNTEER |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,993       99.93       99.93
        .75 |          1        0.01       99.94
          1 |          3        0.03       99.97
          2 |          1        0.01       99.98
          3 |          1        0.01       99.99
          8 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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