Frequencies for first 10,000 rows of popsmas variable in natl1991 dataset :

   PMSA/MSA |
 Population |
       Size |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      4,001       40.01       40.01
          2 |      2,559       25.59       65.60
          9 |      3,440       34.40      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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