Frequencies for first 10,000 rows of prov1495 variable in pos1991 dataset :

lpns/lvns - |
  volunteer |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,994       99.94       99.94
        .25 |          1        0.01       99.95
          1 |          3        0.03       99.98
          2 |          1        0.01       99.99
          7 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 26 Jan 2016