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

     Age of |
Mother Flag |      Freq.     Percent        Cum.
------------+-----------------------------------
          2 |         18        0.18        0.18
          . |      9,982       99.82      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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