Frequencies for first 10,000 rows of popsmas variable in natl2002 dataset :

   PMSA/MSA |
 Population |
       Size |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         91        0.91        0.91
          2 |      4,144       41.44       42.35
          9 |      5,765       57.65      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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