Frequencies for first 10,000 rows of senbefor variable in namcs1993 dataset :

       have |
 you/anyone |
in practice |
   seen pat |
    before? |      Freq.     Percent        Cum.
------------+-----------------------------------
        Yes |      8,703       87.03       87.03
         No |      1,297       12.97      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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