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

   PMSA/MSA |
 Population |
       Size |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      5,180       51.80       51.80
          2 |      1,513       15.13       66.93
          9 |      3,306       33.06       99.99
          Z |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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