Frequencies for first 10,000 rows of pastfl variable in namcs2003 dataset :

 was number |
    of past |
     visits |
   imputed? |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,571       95.71       95.71
          1 |        429        4.29      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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