Frequencies for first 10,000 rows of no_abnorm variable in natl2016 dataset :

No Abnormal |
 Conditions |
  Checked 1 |
       True |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      1,247       12.47       12.47
          1 |      8,715       87.15       99.62
          9 |         38        0.38      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 4 Oct 2017