Frequencies for first 10,000 rows of smsarfip variable in natl1988 dataset :

  FIPS SMSA |
         of |
  Residence |      Freq.     Percent        Cum.
------------+-----------------------------------
       0000 |      4,394       43.94       43.94
       0160 |          1        0.01       43.95
       0450 |        262        2.62       46.57
       0500 |          1        0.01       46.58
       0520 |          4        0.04       46.62
       0920 |          4        0.04       46.66
       1000 |      1,518       15.18       61.84
       1560 |          2        0.02       61.86
       1760 |          2        0.02       61.88
       1800 |         63        0.63       62.51
       1960 |          1        0.01       62.52
       2650 |        355        3.55       66.07
       2880 |        236        2.36       68.43
       3440 |        639        6.39       74.82
       3605 |          1        0.01       74.83
       4480 |          1        0.01       74.84
       4680 |          2        0.02       74.86
       4900 |          1        0.01       74.87
       5160 |      1,030       10.30       85.17
       5240 |      1,124       11.24       96.41
       5560 |          1        0.01       96.42
       5600 |          1        0.01       96.43
       6015 |          3        0.03       96.46
       6025 |          8        0.08       96.54
       6080 |          5        0.05       96.59
       6240 |          2        0.02       96.61
       8280 |          2        0.02       96.63
       8600 |        337        3.37      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 3 Jan 2016