Frequencies for first 10,000 rows of raceun variable in namcs2009 dataset :

          patient race (unimputed) |      Freq.     Percent        Cum.
-----------------------------------+-----------------------------------
                             blank |      2,369       23.69       23.69
                        white only |      6,541       65.41       89.10
       black/african american only |        742        7.42       96.52
                        asian only |        285        2.85       99.37
  native hawaiian/oth pac isl only |         20        0.20       99.57
american indian/alaska native only |         14        0.14       99.71
       more than one race reported |         29        0.29      100.00
-----------------------------------+-----------------------------------
                             Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 28 Mar 2016