Frequencies for first 10,000 rows of metrores variable in natl2003 dataset :

Metropolita |
n Residence |
 County U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      4,278       42.78       42.78
          2 |      5,717       57.17       99.95
          Z |          5        0.05      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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