Frequencies for first 10,000 rows of meconsyn variable in natl1992 dataset :

   Meconium |
 aspiration |
   syndrome |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         18        0.18        0.18
          2 |      9,946       99.46       99.64
          9 |         36        0.36      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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