Frequencies for first 10,000 rows of prov1240 variable in pos1997 dataset :

   subunits |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,969       99.69       99.69
          1 |         20        0.20       99.89
          2 |          4        0.04       99.93
          3 |          1        0.01       99.94
          4 |          2        0.02       99.96
          6 |          1        0.01       99.97
          9 |          1        0.01       99.98
         62 |          1        0.01       99.99
         76 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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