Frequencies for first 10,000 rows of isreferralrequiredforspecialist variable in plan2015 dataset :

       Is a |
   Referral |
   Required |
        for |
Specialist? |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      1,558       15.58       15.58
         No |      6,793       67.93       83.51
        Yes |      1,649       16.49      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 9 Dec 2017