Frequencies for first 10,000 rows of pastfl variable in namcs2004 dataset :

 was number |
    of past |
     visits |
   imputed? |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,375       93.75       93.75
          1 |        625        6.25      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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