Frequencies for first 10,000 rows of urf_lung variable in natl2006 dataset :

   Acute or |
    Chronic |
       Lung |
Disease RFP |
683=f_urf_l |
      ung U |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         45        0.45        0.45
          2 |      9,811       98.11       98.56
          9 |        144        1.44      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Dec 2015