Frequencies for first 10,000 rows of cephalo variable in natl2002 dataset :

Cephalopelv |
         ic |
disproporti |
         on |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        141        1.41        1.41
          2 |      9,560       95.60       97.01
          9 |        299        2.99      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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