Frequencies for first 10,000 rows of form variable in namcs1999 dataset :

   were any medications |
 from a formulary list? |      Freq.     Percent        Cum.
------------------------+-----------------------------------
                     No |        701        7.01        7.01
                    Yes |      1,768       17.68       24.69
                Unknown |      3,889       38.89       63.58
N/A (no drug mentioned) |      3,642       36.42      100.00
------------------------+-----------------------------------
                  Total |     10,000      100.00

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