Frequencies for first 10,000 rows of mrcnty variable in natlterr2010 dataset :

   Mother's |
  County of |
  Residence |
        U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      1,247       12.47       12.47
         10 |      3,414       34.14       46.61
         21 |        215        2.15       48.76
         25 |        149        1.49       50.25
         31 |        185        1.85       52.10
         85 |          4        0.04       52.14
         97 |        108        1.08       53.22
        100 |         45        0.45       53.67
        110 |        961        9.61       63.28
        113 |        230        2.30       65.58
        120 |         61        0.61       66.19
        127 |        417        4.17       70.36
        999 |      2,964       29.64      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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