Frequencies for first 10,000 rows of smsarfip variable in natl1997 dataset :

  FIPS SMSA |
         of |
  Residence |      Freq.     Percent        Cum.
------------+-----------------------------------
       0000 |      3,095       30.95       30.95
       0120 |          1        0.01       30.96
       0440 |          1        0.01       30.97
       0450 |        254        2.54       33.51
       0520 |          1        0.01       33.52
       0920 |         29        0.29       33.81
       1000 |      2,162       21.62       55.43
       1540 |          1        0.01       55.44
       1560 |          2        0.02       55.46
       1800 |         74        0.74       56.20
       2030 |        336        3.36       59.56
       2160 |          1        0.01       59.57
       2180 |        299        2.99       62.56
       2560 |          1        0.01       62.57
       2640 |          1        0.01       62.58
       2650 |        273        2.73       65.31
       2750 |          1        0.01       65.32
       3440 |        793        7.93       73.25
       4480 |          1        0.01       73.26
       5160 |      1,296       12.96       86.22
       5240 |        834        8.34       94.56
       5360 |          1        0.01       94.57
       5380 |          1        0.01       94.58
       5600 |          1        0.01       94.59
       6015 |          1        0.01       94.60
       6080 |          1        0.01       94.61
       6160 |          1        0.01       94.62
       6640 |          1        0.01       94.63
       7400 |          1        0.01       94.64
       7520 |          1        0.01       94.65
       8600 |        343        3.43       98.08
       9999 |        192        1.92      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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