Frequencies for first 10,000 rows of therprev variable in nhamcsopd2004 dataset :

              was |
couns/educ/therap |
     y ordered or |
        provided? |      Freq.     Percent        Cum.
------------------+-----------------------------------
               no |      4,184       41.84       41.84
              yes |      5,729       57.29       99.13
entire item blank |         87        0.87      100.00
------------------+-----------------------------------
            Total |     10,000      100.00

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