Frequencies for first 10,000 rows of uld_cephal variable in natlterr2005 dataset :

Cephalopelv |
         ic |
Disproporti |
       on U |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         49        0.49        0.49
          2 |      4,441       44.41       44.90
          9 |      1,765       17.65       62.55
          . |      3,745       37.45      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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