Frequencies for first 10,000 rows of ssamsasz variable in pos1992 dataset :

    ssa msa |
  size code |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      2,358       23.58       23.58
          A |      1,559       15.59       39.17
          B |      3,254       32.54       71.71
          C |        774        7.74       79.45
          D |      1,146       11.46       90.91
          E |        795        7.95       98.86
          F |        114        1.14      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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