Frequencies for first 10,000 rows of notests variable in nhamcsopd1993 dataset :

      test, |
     procs, |
  therapies |
ordered/pro |
     v-none |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,557       75.57       75.57
          1 |      2,443       24.43      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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