Frequencies for first 10,000 rows of smsarfip variable in natl1983 dataset :

  FIPS SMSA |
         of |
  Residence |      Freq.     Percent        Cum.
------------+-----------------------------------
       0000 |      3,917       39.17       39.17
       0120 |          1        0.01       39.18
       0450 |        387        3.87       43.05
       0520 |          1        0.01       43.06
       0920 |          1        0.01       43.07
       1000 |      1,951       19.51       62.58
       1280 |          1        0.01       62.59
       1560 |          2        0.02       62.61
       1660 |          1        0.01       62.62
       1800 |         52        0.52       63.14
       2160 |          1        0.01       63.15
       2650 |        372        3.72       66.87
       2750 |          3        0.03       66.90
       2880 |        252        2.52       69.42
       3440 |        828        8.28       77.70
       4200 |          1        0.01       77.71
       4720 |          1        0.01       77.72
       5000 |          1        0.01       77.73
       5120 |          1        0.01       77.74
       5160 |      1,342       13.42       91.16
       5240 |        646        6.46       97.62
       5360 |          1        0.01       97.63
       6015 |          2        0.02       97.65
       6025 |          3        0.03       97.68
       6080 |         12        0.12       97.80
       7240 |          1        0.01       97.81
       8600 |        218        2.18       99.99
       8720 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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