Frequencies for first 10,000 rows of pastvis variable in nhamcsopd2005 dataset :

   if yes, how |
     many past |
 visits in the |
       last 12 |
       months? |      Freq.     Percent        Cum.
---------------+-----------------------------------
          none |        388        3.88        3.88
           1-2 |      2,532       25.32       29.20
           3-5 |      2,409       24.09       53.29
     6 or more |      3,071       30.71       84.00
not applicable |      1,600       16.00      100.00
---------------+-----------------------------------
         Total |     10,000      100.00

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