Frequencies for first 10,000 rows of isreferralrequiredforspecialist variable in plan2014 dataset :

       Is a |
   Referral |
   Required |
        for |
Specialist? |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      1,980       19.80       19.80
         No |      6,007       60.07       79.87
        Yes |      2,013       20.13      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 8 Dec 2017