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

    popsize |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      1,246       12.46       12.46
          1 |        949        9.49       21.95
          2 |        634        6.34       28.29
          3 |        751        7.51       35.80
          4 |        733        7.33       43.13
          5 |        787        7.87       51.00
          6 |        859        8.59       59.59
          9 |      4,021       40.21       99.80
          Z |         20        0.20      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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