Frequencies for first 10,000 rows of prov1505 variable in pos1991 dataset :

 registered |
   nurses - |
  volunteer |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,962       99.62       99.62
         .2 |          1        0.01       99.63
        .25 |         11        0.11       99.74
         .5 |          2        0.02       99.76
        .75 |          2        0.02       99.78
          1 |          7        0.07       99.85
          2 |          9        0.09       99.94
          3 |          1        0.01       99.95
          4 |          2        0.02       99.97
          8 |          1        0.01       99.98
         10 |          1        0.01       99.99
         12 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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