Frequencies for first 10,000 rows of raceun variable in namcs2007 dataset :

          patient race (unimputed) |      Freq.     Percent        Cum.
-----------------------------------+-----------------------------------
                             blank |      3,223       32.23       32.23
                        white only |      5,684       56.84       89.07
       black/african american only |        794        7.94       97.01
                        asian only |        241        2.41       99.42
  native hawaiian/oth pac isl only |         18        0.18       99.60
american indian/alaska native only |         24        0.24       99.84
       more than one race reported |         16        0.16      100.00
-----------------------------------+-----------------------------------
                             Total |     10,000      100.00

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