Frequencies for first 10,000 rows of race variable in nhamcsopd1999 dataset :

                        patient race |      Freq.     Percent        Cum.
-------------------------------------+-----------------------------------
                               White |      6,376       63.76       63.76
              Black/African American |      3,266       32.66       96.42
Asian or Native Hawaiian/Oth Pac Isl |        322        3.22       99.64
       American Indian/Alaska Native |         13        0.13       99.77
         More than one race reported |         23        0.23      100.00
-------------------------------------+-----------------------------------
                               Total |     10,000      100.00

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