Frequencies for first 10,000 rows of cephalo variable in natl1992 dataset :

Cephalopelv |
         ic |
disproporti |
         on |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        443        4.43        4.43
          2 |      9,520       95.20       99.63
          8 |          1        0.01       99.64
          9 |         36        0.36      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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