Frequencies for first 10,000 rows of ssamsasz variable in pos1994 dataset :

    ssa msa |
  size code |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      2,373       23.73       23.73
          A |      1,584       15.84       39.57
          B |      3,144       31.44       71.01
          C |        836        8.36       79.37
          D |      1,205       12.05       91.42
          E |        738        7.38       98.80
          F |        120        1.20      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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