Frequencies for first 10,000 rows of origf variable in natl1988 dataset :

  Origin or |
 Descent of |
     Father |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,027       70.27       70.27
          1 |         23        0.23       70.50
          2 |         21        0.21       70.71
          3 |          4        0.04       70.75
          4 |          5        0.05       70.80
          5 |         10        0.10       70.90
         99 |      2,910       29.10      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 3 Jan 2016