Frequencies for first 10,000 rows of pastvis variable in namcs2001 dataset :

 how many past |
visits in last |
    12 months? |      Freq.     Percent        Cum.
---------------+-----------------------------------
         Blank |        395        3.95        3.95
          None |        719        7.19       11.14
           1-2 |      2,661       26.61       37.75
           3-5 |      2,335       23.35       61.10
     6 or more |      2,077       20.77       81.87
       Unknown |        336        3.36       85.23
Not applicable |      1,477       14.77      100.00
---------------+-----------------------------------
         Total |     10,000      100.00

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