Frequencies for first 10,000 rows of retunsp variable in namcs2014 dataset :

  Return at |
unspecified |
       time |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      9,483       94.83       94.83
        Yes |        517        5.17      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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