Frequencies for first 10,000 rows of prov1240 variable in pos2001 dataset :

   subunits |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,976       99.76       99.76
          1 |         16        0.16       99.92
          2 |          4        0.04       99.96
          4 |          2        0.02       99.98
          9 |          1        0.01       99.99
         74 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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