Frequencies for first 10,000 rows of uld_meco variable in natlterr2006 dataset :

   Meconium |
        RFP |
712=f_uld_m |
econium U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        278        2.78        2.78
          2 |      8,181       81.81       84.59
          9 |      1,541       15.41      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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