Frequencies for first 10,000 rows of ssamsasz variable in pos2007 dataset :

    ssa msa |
  size code |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      3,124       31.24       31.24
          A |      1,391       13.91       45.15
          B |      2,510       25.10       70.25
          C |        823        8.23       78.48
          D |      1,198       11.98       90.46
          E |        804        8.04       98.50
          F |        150        1.50      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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