Frequencies for first 10,000 rows of no_abnorm variable in natl2014 dataset :

No Abnormal |
 Conditions |
  Checked 1 |
       True |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        996        9.96        9.96
          1 |      8,735       87.35       97.31
          9 |        269        2.69      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 15 Jun 2016