Frequencies for first 10,000 rows of ld_mecs variable in natlterr2011 dataset :

   Meconium |
   Staining |
        RFP |
614=f_ld_me |
      con R |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      2,536       25.36       25.36
          N |      6,272       62.72       88.08
          U |      1,092       10.92       99.00
          Y |        100        1.00      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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