Frequencies for first 10,000 rows of therprev variable in nhamcsopd2003 dataset :

              was |
couns/educ/therap |
     y ordered or |
        provided? |      Freq.     Percent        Cum.
------------------+-----------------------------------
               no |      4,850       48.50       48.50
              yes |      4,996       49.96       98.46
entire item blank |        154        1.54      100.00
------------------+-----------------------------------
            Total |     10,000      100.00

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