Frequencies for first 10,000 rows of msa variable in natl2003 dataset :

Metropolita |
          n |
Statistical |
   Area U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      5,722       57.22       57.22
        380 |      4,265       42.65       99.87
        600 |          1        0.01       99.88
        720 |          1        0.01       99.89
       1000 |          2        0.02       99.91
       2880 |          1        0.01       99.92
       3600 |          1        0.01       99.93
       4120 |          1        0.01       99.94
       5240 |          4        0.04       99.98
       8050 |          1        0.01       99.99
       8600 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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