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

 how many past |
visits in last |
    12 months? |      Freq.     Percent        Cum.
---------------+-----------------------------------
          None |        621        6.21        6.21
           1-2 |      3,076       30.76       36.97
           3-5 |      2,694       26.94       63.91
     6 or more |      2,167       21.67       85.58
Not applicable |      1,442       14.42      100.00
---------------+-----------------------------------
         Total |     10,000      100.00

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