Frequencies for first 10,000 rows of pateven variable in namcs2012 dataset :

       Do you see |
  patients during |
the evening or on |
  weekends at the |
          office? |      Freq.     Percent        Cum.
------------------+-----------------------------------
          Unknown |          3        0.03        0.03
              Yes |      3,506       35.06       35.09
               No |      6,491       64.91      100.00
------------------+-----------------------------------
            Total |     10,000      100.00

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