Frequencies for first 10,000 rows of pastvis variable in nhamcsopd2002 dataset :

 how many past |
visits in last |
    12 months? |      Freq.     Percent        Cum.
---------------+-----------------------------------
         Blank |        353        3.53        3.53
          None |        299        2.99        6.52
           1-2 |      2,476       24.76       31.28
           3-5 |      2,503       25.03       56.31
     6 or more |      2,411       24.11       80.42
       Unknown |        494        4.94       85.36
Not applicable |      1,464       14.64      100.00
---------------+-----------------------------------
         Total |     10,000      100.00

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