Frequencies for first 10,000 rows of ager12 variable in mort1975 dataset :

     ager12 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,544       15.44       15.44
          2 |        232        2.32       17.76
          3 |        119        1.19       18.95
          4 |        149        1.49       20.44
          5 |        233        2.33       22.77
          6 |        377        3.77       26.54
          7 |        854        8.54       35.08
          8 |      1,445       14.45       49.53
          9 |      1,938       19.38       68.91
         10 |      2,078       20.78       89.69
         11 |      1,027       10.27       99.96
         12 |          4        0.04      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Dec 2015