Frequencies for first 10,000 rows of origm variable in linkco1991us_num dataset :

  Origin of |
     mother |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |         10        0.10        0.10
          1 |      9,990       99.90      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Dec 2015