Frequencies for first 10,000 rows of senbefor variable in namcs1996 dataset :

       have |
 you/anyone |
in practice |
   seen pat |
    before? |      Freq.     Percent        Cum.
------------+-----------------------------------
        Yes |      8,650       86.50       86.50
         No |      1,350       13.50      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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