Frequencies for first 10,000 rows of mrstate variable in natlterr2003 dataset :

   Mother's |
  Residence |
  State U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
         FL |          3        0.03        0.03
         MD |          1        0.01        0.04
         PR |      9,976       99.76       99.80
         TX |          1        0.01       99.81
         VA |          1        0.01       99.82
         VI |          1        0.01       99.83
         ZZ |         17        0.17      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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