Frequencies for first 10,000 rows of raceun variable in nhamcsed2013 dataset :

                    Unimputed race |      Freq.     Percent        Cum.
-----------------------------------+-----------------------------------
                             Blank |      2,310       23.10       23.10
                        White Only |      4,797       47.97       71.07
       Black/African American Only |      2,420       24.20       95.27
                        Asian Only |        350        3.50       98.77
  Native Hawaiian/Oth Pac Isl Only |         29        0.29       99.06
American Indian/Alaska Native Only |         41        0.41       99.47
       More than one race reported |         53        0.53      100.00
-----------------------------------+-----------------------------------
                             Total |     10,000      100.00

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