Frequencies for first 10,000 rows of me_pres variable in natl2014 dataset :

      Fetal |
Presentatio |
       n at |
 Delivery 1 |
   Cephalic |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      9,408       94.08       94.08
          2 |        419        4.19       98.27
          3 |        167        1.67       99.94
          9 |          6        0.06      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 15 Jun 2016