Frequencies for first 10,000 rows of sigmoid variable in namcs2013 dataset :

Sigmoidosco |
         py |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      9,972       99.72       99.72
        Yes |         28        0.28      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 27 Mar 2017