Frequencies for first 10,000 rows of ucr69 variable in mort1975 dataset :

      ucr69 |      Freq.     Percent        Cum.
------------+-----------------------------------
         10 |         64        0.64        0.64
         20 |      2,015       20.15       20.79
         40 |      2,578       25.78       46.57
         50 |        758        7.58       54.15
         60 |          8        0.08       54.23
         70 |         15        0.15       54.38
         80 |        308        3.08       57.46
         90 |      3,998       39.98       97.44
        130 |        256        2.56      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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