Frequencies for first 10,000 rows of raceun variable in nhamcsed2012 dataset :

                    Unimputed race |      Freq.     Percent        Cum.
-----------------------------------+-----------------------------------
                             Blank |      1,816       18.16       18.16
                        White Only |      6,291       62.91       81.07
       Black/African American Only |      1,751       17.51       98.58
                        Asian Only |        107        1.07       99.65
  Native Hawaiian/Oth Pac Isl Only |         12        0.12       99.77
American Indian/Alaska Native Only |         10        0.10       99.87
       More than one race reported |         13        0.13      100.00
-----------------------------------+-----------------------------------
                             Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 7 Nov 2016