Frequencies for first 10,000 rows of therprev variable in nhamcsopd2000 dataset :

       were |
therapeutic |
 /prev serv |
ordered/pro |
     vided? |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      5,625       56.25       56.25
        Yes |      4,115       41.15       97.40
  No answer |        260        2.60      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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