Frequencies for first 10,000 rows of uld_meco variable in natl2005 dataset :

   Meconium |
        U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        498        4.98        4.98
          2 |      9,383       93.83       98.81
          9 |        119        1.19      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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