Frequencies for first 10,000 rows of raceun variable in nhamcsopd2007 dataset :

          patient race (unimputed) |      Freq.     Percent        Cum.
-----------------------------------+-----------------------------------
                             blank |      1,527       15.27       15.27
                        white only |      5,514       55.14       70.41
       black/african american only |      2,463       24.63       95.04
                        asian only |        261        2.61       97.65
  native hawaiian/oth pac isl only |         26        0.26       97.91
american indian/alaska native only |         22        0.22       98.13
       more than one race reported |        187        1.87      100.00
-----------------------------------+-----------------------------------
                             Total |     10,000      100.00

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