Frequencies for first 10,000 rows of no_abnorm variable in natlterr2015 dataset :

No Abnormal |
 Conditions |
  Checked 1 |
       True |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      1,897       18.97       18.97
          1 |      8,009       80.09       99.06
          9 |         94        0.94      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 20 Oct 2016