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

    Hyaline |
   Membrane |
Disease RFP |
743=f_uab_h |
   yaline U |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |          1        0.01        0.01
          2 |      4,781       47.81       47.82
          9 |      1,493       14.93       62.75
          . |      3,725       37.25      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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