Frequencies for first 10,000 rows of famplan variable in nhamcsopd2009 dataset :

     family |
planning/co |
ntraception |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      9,788       97.88       97.88
        yes |        212        2.12      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 28 Mar 2016