Frequencies for first 10,000 rows of spiro variable in nhamcsopd2006 dataset :

spirometry/ |
  pulmonary |
   function |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      9,900       99.00       99.00
        Yes |        100        1.00      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 28 Mar 2016