Frequencies for first 10,000 rows of notests variable in namcs1993 dataset :

      test, |
     procs, |
  therapies |
ordered/pro |
     v-none |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,286       72.86       72.86
          1 |      2,714       27.14      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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