Frequencies for first 10,000 rows of cmsa variable in natlterr1997 dataset :

    CMSA of |
  Residence |
     (FIPS) |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      3,783       37.83       37.83
         87 |      6,217       62.17      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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