Frequencies for first 10,000 rows of form variable in namcs1997 dataset :

   were any medications |
 from a formulary list? |      Freq.     Percent        Cum.
------------------------+-----------------------------------
                     No |      1,570       15.70       15.70
                    Yes |      2,428       24.28       39.98
                Unknown |      6,000       60.00       99.98
N/A (no drug mentioned) |          2        0.02      100.00
------------------------+-----------------------------------
                  Total |     10,000      100.00

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