Frequencies for first 10,000 rows of cmsa variable in natlterr1998 dataset :

    CMSA of |
  Residence |
     (FIPS) |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      3,618       36.18       36.18
         87 |      6,382       63.82      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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