Frequencies for first 10,000 rows of hpe variable in nhamcsed2014 dataset :

       Does |
    patient |
      have: |
 History of |
  pulmonary |
   embolism |
    (PE) or |
  deep vein |
 thrombosis |
         (D |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      9,922       99.22       99.22
        Yes |         78        0.78      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 11 Apr 2017