Frequencies for first 10,000 rows of pct012e152 variable in sf12000860us20 dataset :

   45 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,745       97.45       97.45
          1 |        233        2.33       99.78
          2 |         21        0.21       99.99
          4 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 18 Apr 2017