Frequencies for first 10,000 rows of smsarfip variable in natl1987 dataset :

  FIPS SMSA |
         of |
  Residence |      Freq.     Percent        Cum.
------------+-----------------------------------
       0000 |      3,645       36.45       36.45
       0450 |        389        3.89       40.34
       0520 |          2        0.02       40.36
       0920 |          2        0.02       40.38
       1000 |      1,556       15.56       55.94
       1560 |          2        0.02       55.96
       1800 |         57        0.57       56.53
       2650 |        364        3.64       60.17
       2680 |          1        0.01       60.18
       2880 |        272        2.72       62.90
       3440 |      1,079       10.79       73.69
       3600 |          1        0.01       73.70
       5000 |          1        0.01       73.71
       5080 |          1        0.01       73.72
       5160 |      1,600       16.00       89.72
       5240 |        741        7.41       97.13
       5360 |          1        0.01       97.14
       5560 |          1        0.01       97.15
       5720 |          1        0.01       97.16
       6015 |          2        0.02       97.18
       6025 |         11        0.11       97.29
       6080 |          3        0.03       97.32
       8600 |        268        2.68      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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