Frequencies for first 10,000 rows of cephalo variable in natl1989 dataset :

Cephalopelv |
         ic |
disproporti |
         on |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        510        5.10        5.10
          2 |      9,264       92.64       97.74
          8 |          1        0.01       97.75
          9 |        225        2.25      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 3 Jan 2016