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

 how many past |
visits in last |
    12 months? |      Freq.     Percent        Cum.
---------------+-----------------------------------
          None |        741        7.41        7.41
           1-2 |      3,109       31.09       38.50
           3-5 |      2,640       26.40       64.90
     6 or more |      2,075       20.75       85.65
Not applicable |      1,435       14.35      100.00
---------------+-----------------------------------
         Total |     10,000      100.00

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