Frequencies for age variable in ncestagesexres dataset :

        Age |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |          3        0.98        0.98
          1 |          3        0.98        1.96
          2 |          3        0.98        2.94
          3 |          3        0.98        3.92
          4 |          3        0.98        4.90
          5 |          3        0.98        5.88
          6 |          3        0.98        6.86
          7 |          3        0.98        7.84
          8 |          3        0.98        8.82
          9 |          3        0.98        9.80
         10 |          3        0.98       10.78
         11 |          3        0.98       11.76
         12 |          3        0.98       12.75
         13 |          3        0.98       13.73
         14 |          3        0.98       14.71
         15 |          3        0.98       15.69
         16 |          3        0.98       16.67
         17 |          3        0.98       17.65
         18 |          3        0.98       18.63
         19 |          3        0.98       19.61
         20 |          3        0.98       20.59
         21 |          3        0.98       21.57
         22 |          3        0.98       22.55
         23 |          3        0.98       23.53
         24 |          3        0.98       24.51
         25 |          3        0.98       25.49
         26 |          3        0.98       26.47
         27 |          3        0.98       27.45
         28 |          3        0.98       28.43
         29 |          3        0.98       29.41
         30 |          3        0.98       30.39
         31 |          3        0.98       31.37
         32 |          3        0.98       32.35
         33 |          3        0.98       33.33
         34 |          3        0.98       34.31
         35 |          3        0.98       35.29
         36 |          3        0.98       36.27
         37 |          3        0.98       37.25
         38 |          3        0.98       38.24
         39 |          3        0.98       39.22
         40 |          3        0.98       40.20
         41 |          3        0.98       41.18
         42 |          3        0.98       42.16
         43 |          3        0.98       43.14
         44 |          3        0.98       44.12
         45 |          3        0.98       45.10
         46 |          3        0.98       46.08
         47 |          3        0.98       47.06
         48 |          3        0.98       48.04
         49 |          3        0.98       49.02
         50 |          3        0.98       50.00
         51 |          3        0.98       50.98
         52 |          3        0.98       51.96
         53 |          3        0.98       52.94
         54 |          3        0.98       53.92
         55 |          3        0.98       54.90
         56 |          3        0.98       55.88
         57 |          3        0.98       56.86
         58 |          3        0.98       57.84
         59 |          3        0.98       58.82
         60 |          3        0.98       59.80
         61 |          3        0.98       60.78
         62 |          3        0.98       61.76
         63 |          3        0.98       62.75
         64 |          3        0.98       63.73
         65 |          3        0.98       64.71
         66 |          3        0.98       65.69
         67 |          3        0.98       66.67
         68 |          3        0.98       67.65
         69 |          3        0.98       68.63
         70 |          3        0.98       69.61
         71 |          3        0.98       70.59
         72 |          3        0.98       71.57
         73 |          3        0.98       72.55
         74 |          3        0.98       73.53
         75 |          3        0.98       74.51
         76 |          3        0.98       75.49
         77 |          3        0.98       76.47
         78 |          3        0.98       77.45
         79 |          3        0.98       78.43
         80 |          3        0.98       79.41
         81 |          3        0.98       80.39
         82 |          3        0.98       81.37
         83 |          3        0.98       82.35
         84 |          3        0.98       83.33
         85 |          3        0.98       84.31
         86 |          3        0.98       85.29
         87 |          3        0.98       86.27
         88 |          3        0.98       87.25
         89 |          3        0.98       88.24
         90 |          3        0.98       89.22
         91 |          3        0.98       90.20
         92 |          3        0.98       91.18
         93 |          3        0.98       92.16
         94 |          3        0.98       93.14
         95 |          3        0.98       94.12
         96 |          3        0.98       95.10
         97 |          3        0.98       96.08
         98 |          3        0.98       97.06
         99 |          3        0.98       98.04
        100 |          3        0.98       99.02
        999 |          3        0.98      100.00
------------+-----------------------------------
      Total |        306      100.00

by Jean Roth , jroth@nber.org , 6 Nov 2017