Frequencies for first 10,000 rows of raceun variable in namcs2011 dataset :

          Patient Race (unimputed) |      Freq.     Percent        Cum.
-----------------------------------+-----------------------------------
                             Blank |      2,420       24.20       24.20
                        White Only |      6,438       64.38       88.58
       Black/African American Only |        712        7.12       95.70
                        Asian Only |        353        3.53       99.23
  Native Hawaiian/Oth Pac Isl Only |         16        0.16       99.39
American Indian/Alaska Native Only |         30        0.30       99.69
       More than one race reported |         31        0.31      100.00
-----------------------------------+-----------------------------------
                             Total |     10,000      100.00

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