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

       FIPS |
PMSA/MSA of |
  Residence |      Freq.     Percent        Cum.
------------+-----------------------------------
       0000 |      1,577       15.77       15.77
       0060 |        372        3.72       19.49
       0470 |        448        4.48       23.97
       1310 |        778        7.78       31.75
       4840 |        601        6.01       37.76
       6360 |      1,068       10.68       48.44
       7440 |      5,156       51.56      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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