Frequencies for first 10,000 rows of ssamsasz variable in pos2008 dataset :

    ssa msa |
  size code |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      3,148       31.48       31.48
          A |      1,404       14.04       45.52
          B |      2,494       24.94       70.46
          C |        821        8.21       78.67
          D |      1,194       11.94       90.61
          E |        794        7.94       98.55
          F |        145        1.45      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 17 May 2017