Frequencies for first 10,000 rows of smsarfip variable in natl2002 dataset :

PMSA/MSA of |
  Residence |
     (FIPS) |      Freq.     Percent        Cum.
------------+-----------------------------------
       0000 |      5,765       57.65       57.65
       0040 |          1        0.01       57.66
       0160 |          1        0.01       57.67
       0280 |          1        0.01       57.68
       0380 |      4,130       41.30       98.98
       1000 |         62        0.62       99.60
       1125 |          1        0.01       99.61
       2030 |          2        0.02       99.63
       2180 |          3        0.03       99.66
       3283 |          1        0.01       99.67
       3440 |          9        0.09       99.76
       5160 |          6        0.06       99.82
       5240 |         12        0.12       99.94
       8600 |          6        0.06      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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