Frequencies for first 10,000 rows of uld_meco variable in natlterr2005 dataset :

   Meconium |
        U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        352        3.52        3.52
          2 |      7,881       78.81       82.33
          9 |      1,767       17.67      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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