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

   Anemia U |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         16        0.16        0.16
          2 |      9,855       98.55       98.71
          9 |        129        1.29      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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