Frequencies for first 10,000 rows of ssamsasz variable in pos2002 dataset :

    ssa msa |
  size code |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      2,833       28.33       28.33
          A |      1,527       15.27       43.60
          B |      2,801       28.01       71.61
          C |        758        7.58       79.19
          D |      1,182       11.82       91.01
          E |        763        7.63       98.64
          F |        136        1.36      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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