Frequencies for first 10,000 rows of raceun variable in nhamcsopd2009 dataset :

          patient race (unimputed) |      Freq.     Percent        Cum.
-----------------------------------+-----------------------------------
                             blank |      1,355       13.55       13.55
                        white only |      5,757       57.57       71.12
       black/african american only |      2,345       23.45       94.57
                        asian only |        317        3.17       97.74
  native hawaiian/oth pac isl only |         22        0.22       97.96
american indian/alaska native only |         68        0.68       98.64
       more than one race reported |        136        1.36      100.00
-----------------------------------+-----------------------------------
                             Total |     10,000      100.00

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