Frequencies for first 10,000 rows of urf_anemia variable in natl2005 dataset :

   Anemia U |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        448        4.48        4.48
          2 |      9,429       94.29       98.77
          9 |        123        1.23      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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