Frequencies for first 10,000 rows of cephalo variable in natl1991 dataset :

Cephalopelv |
         ic |
disproporti |
         on |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        492        4.92        4.92
          2 |      9,476       94.76       99.68
          8 |          2        0.02       99.70
          9 |         30        0.30      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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