Frequencies for first 10,000 rows of urf_lung variable in natlterr2006 dataset :

   Acute or |
    Chronic |
       Lung |
Disease RFP |
683=f_urf_l |
      ung U |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         17        0.17        0.17
          2 |      4,779       47.79       47.96
          9 |      1,479       14.79       62.75
          . |      3,725       37.25      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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