Frequencies for first 10,000 rows of mrcntyfips variable in natlterr2006 dataset :

   Mother's |
  County of |
  Residence |
     (FIPS) |
Territory/P |
   osession |
        U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      6,277       62.77       62.77
         21 |        186        1.86       64.63
         25 |        134        1.34       65.97
         31 |        173        1.73       67.70
         97 |         77        0.77       68.47
        113 |        197        1.97       70.44
        127 |        383        3.83       74.27
        999 |      2,573       25.73      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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