Frequencies for first 10,000 rows of cephalo variable in natl1990 dataset :

Cephalopelv |
         ic |
disproporti |
         on |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        546        5.46        5.46
          2 |      9,385       93.85       99.31
          8 |          3        0.03       99.34
          9 |         66        0.66      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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