Frequencies for first 10,000 rows of mrace variable in linkpe2009psden dataset :

   Mother's |
     Race U |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        257        2.57        2.57
          2 |         34        0.34        2.91
          3 |          3        0.03        2.94
          4 |         48        0.48        3.42
          5 |         57        0.57        3.99
          6 |          8        0.08        4.07
          7 |        605        6.05       10.12
          8 |      1,048       10.48       20.60
         58 |      1,362       13.62       34.22
          . |      6,578       65.78      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Dec 2015