Frequencies for first 10,000 rows of prdiag4 variable in namcs2015 dataset :

         Is |
  diagnosis |
         #4 |
  probable, |
questionabl |
  e or rule |
       out? |      Freq.     Percent        Cum.
------------+-----------------------------------
         -7 |      7,391       73.91       73.91
          1 |         12        0.12       74.03
          2 |      2,597       25.97      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 25 Oct 2017