Frequencies for first 10,000 rows of smsarfip variable in natl2001 dataset :

PMSA/MSA of |
  Residence |
     (FIPS) |      Freq.     Percent        Cum.
------------+-----------------------------------
       0000 |      3,090       30.90       30.90
       0450 |        245        2.45       33.35
       0520 |          4        0.04       33.39
       0920 |         36        0.36       33.75
       1000 |      2,231       22.31       56.06
       1800 |         75        0.75       56.81
       2030 |        320        3.20       60.01
       2160 |          1        0.01       60.02
       2180 |        307        3.07       63.09
       2580 |          1        0.01       63.10
       2650 |        267        2.67       65.77
       2720 |          1        0.01       65.78
       2750 |          1        0.01       65.79
       3440 |        725        7.25       73.04
       3660 |          1        0.01       73.05
       4420 |          1        0.01       73.06
       4520 |          1        0.01       73.07
       5160 |      1,297       12.97       86.04
       5240 |        804        8.04       94.08
       6015 |          1        0.01       94.09
       6080 |          2        0.02       94.11
       7160 |          1        0.01       94.12
       8600 |        369        3.69       97.81
       8840 |          2        0.02       97.83
       9999 |        217        2.17      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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