Frequencies for first 10,000 rows of meconsyn variable in natl1995 dataset :

   Meconium |
 aspiration |
   syndrome |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         20        0.20        0.20
          2 |      9,926       99.26       99.46
          9 |         54        0.54      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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