Frequencies for first 10,000 rows of raceun variable in nhamcsed2015 dataset :

                    Unimputed race |      Freq.     Percent        Cum.
-----------------------------------+-----------------------------------
                             Blank |      2,143       21.43       21.43
                        White Only |      6,011       60.11       81.54
       Black/African American Only |      1,663       16.63       98.17
                        Asian Only |        124        1.24       99.41
  Native Hawaiian/Oth Pac Isl Only |         19        0.19       99.60
American Indian/Alaska Native Only |         22        0.22       99.82
       More than one race reported |         18        0.18      100.00
-----------------------------------+-----------------------------------
                             Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 20 Nov 2017