Frequencies for first 10,000 rows of smsa70 variable in morg83 dataset :

          smsa70 |      Freq.     Percent        Cum.
-----------------+-----------------------------------
  3 million plus |      3,438       34.38       34.38
     1-3 million |      2,142       21.42       55.80
               . |      4,420       44.20      100.00
-----------------+-----------------------------------
           Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 15 Mar 2017