Frequencies for first 10,000 rows of prov1240 variable in pos1993 dataset :

   subunits |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,975       99.75       99.75
          1 |         15        0.15       99.90
          2 |          3        0.03       99.93
          4 |          1        0.01       99.94
          5 |          1        0.01       99.95
          6 |          2        0.02       99.97
          8 |          1        0.01       99.98
         63 |          1        0.01       99.99
         75 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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