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

      Fetal |
   Distress |
        RFP |
725=f_uld_d |
     istr U |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         71        0.71        0.71
          2 |      4,663       46.63       47.34
          9 |      1,541       15.41       62.75
          . |      3,725       37.25      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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