Frequencies for first 10,000 rows of hpe variable in namcs2014 dataset :

       Does |
patient now |
      have: |
 History of |
  pulmonary |
embolism or |
  deep vein |
 thrombosis |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      9,939       99.39       99.39
        Yes |         61        0.61      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 27 Mar 2017