Frequencies for first 10,000 rows of uld_meco variable in natl2013 dataset :

   Meconium |
        RFP |
712=f_uld_m |
econium U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,140       11.40       11.40
          2 |      8,707       87.07       98.47
          9 |        153        1.53      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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