Frequencies for first 10,000 rows of mage_impflg variable in natlterr2007 dataset :

   Mother's |
        Age |
  Imputated |
   Flag U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |          4        0.04        0.04
          . |      9,996       99.96      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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