Frequencies for first 10,000 rows of pastvis variable in nhamcsopd2003 dataset :

 how many past |
visits in last |
    12 months? |      Freq.     Percent        Cum.
---------------+-----------------------------------
          none |        454        4.54        4.54
           1-2 |      2,621       26.21       30.75
           3-5 |      2,564       25.64       56.39
     6 or more |      2,728       27.28       83.67
not applicable |      1,633       16.33      100.00
---------------+-----------------------------------
         Total |     10,000      100.00

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