Frequencies for first 10,000 rows of pastvis variable in nhamcsopd2006 dataset :

   if yes, how |
     many past |
 visits in the |
       last 12 |
       months? |      Freq.     Percent        Cum.
---------------+-----------------------------------
          None |        447        4.47        4.47
           1-2 |      2,662       26.62       31.09
           3-5 |      2,331       23.31       54.40
     6 or more |      2,843       28.43       82.83
Not applicable |      1,717       17.17      100.00
---------------+-----------------------------------
         Total |     10,000      100.00

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