Frequencies for first 10,000 rows of metrores variable in natlterr1996 dataset :

 Met/Nonmet |
  county of |
  residence |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      8,321       83.21       83.21
          2 |      1,668       16.68       99.89
          9 |          6        0.06       99.95
          Z |          5        0.05      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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