Frequencies for first 10,000 rows of popsmas variable in natlterr1996 dataset :

   PMSA/MSA |
 Population |
       Size |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      6,894       68.94       68.94
          2 |      1,427       14.27       83.21
          9 |      1,668       16.68       99.89
          Z |         11        0.11      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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