Frequencies for first 10,000 rows of ssamsasz variable in pos1997 dataset :

    ssa msa |
  size code |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      2,696       26.96       26.96
          A |      1,519       15.19       42.15
          B |      2,974       29.74       71.89
          C |        752        7.52       79.41
          D |      1,155       11.55       90.96
          E |        772        7.72       98.68
          F |        132        1.32      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 26 Jan 2016