Frequencies for first 10,000 rows of age variable in nhamcsopd2002 dataset :

    patient age in |
             years |      Freq.     Percent        Cum.
-------------------+-----------------------------------
    Under one year |        417        4.17        4.17
                 1 |        181        1.81        5.98
                 2 |        131        1.31        7.29
                 3 |        134        1.34        8.63
                 4 |        121        1.21        9.84
                 5 |         92        0.92       10.76
                 6 |         93        0.93       11.69
                 7 |         74        0.74       12.43
                 8 |         97        0.97       13.40
                 9 |         76        0.76       14.16
                10 |         96        0.96       15.12
                11 |        106        1.06       16.18
                12 |         98        0.98       17.16
                13 |         82        0.82       17.98
                14 |         83        0.83       18.81
                15 |         98        0.98       19.79
                16 |         97        0.97       20.76
                17 |        122        1.22       21.98
                18 |        108        1.08       23.06
                19 |        104        1.04       24.10
                20 |        130        1.30       25.40
                21 |        184        1.84       27.24
                22 |        177        1.77       29.01
                23 |        147        1.47       30.48
                24 |        167        1.67       32.15
                25 |        127        1.27       33.42
                26 |        158        1.58       35.00
                27 |        144        1.44       36.44
                28 |        121        1.21       37.65
                29 |        119        1.19       38.84
                30 |        159        1.59       40.43
                31 |        150        1.50       41.93
                32 |        149        1.49       43.42
                33 |        132        1.32       44.74
                34 |        142        1.42       46.16
                35 |        162        1.62       47.78
                36 |        117        1.17       48.95
                37 |        139        1.39       50.34
                38 |        145        1.45       51.79
                39 |        176        1.76       53.55
                40 |        142        1.42       54.97
                41 |        148        1.48       56.45
                42 |        131        1.31       57.76
                43 |        159        1.59       59.35
                44 |        144        1.44       60.79
                45 |        127        1.27       62.06
                46 |        144        1.44       63.50
                47 |        155        1.55       65.05
                48 |        135        1.35       66.40
                49 |        153        1.53       67.93
                50 |        155        1.55       69.48
                51 |        143        1.43       70.91
                52 |        149        1.49       72.40
                53 |        156        1.56       73.96
                54 |        142        1.42       75.38
                55 |        147        1.47       76.85
                56 |        128        1.28       78.13
                57 |        147        1.47       79.60
                58 |        118        1.18       80.78
                59 |        109        1.09       81.87
                60 |        115        1.15       83.02
                61 |        126        1.26       84.28
                62 |         95        0.95       85.23
                63 |        116        1.16       86.39
                64 |        108        1.08       87.47
                65 |        109        1.09       88.56
                66 |         76        0.76       89.32
                67 |         90        0.90       90.22
                68 |         75        0.75       90.97
                69 |         61        0.61       91.58
                70 |         74        0.74       92.32
                71 |         65        0.65       92.97
                72 |         61        0.61       93.58
                73 |         69        0.69       94.27
                74 |         59        0.59       94.86
                75 |         66        0.66       95.52
                76 |         54        0.54       96.06
                77 |         45        0.45       96.51
                78 |         55        0.55       97.06
                79 |         44        0.44       97.50
                80 |         42        0.42       97.92
                81 |         26        0.26       98.18
                82 |         46        0.46       98.64
                83 |         23        0.23       98.87
                84 |         23        0.23       99.10
                85 |         21        0.21       99.31
                86 |         14        0.14       99.45
                87 |         12        0.12       99.57
                88 |         17        0.17       99.74
                89 |          6        0.06       99.80
                90 |          7        0.07       99.87
                91 |          4        0.04       99.91
                92 |          2        0.02       99.93
                93 |          1        0.01       99.94
                94 |          3        0.03       99.97
                97 |          1        0.01       99.98
                98 |          1        0.01       99.99
100 years and over |          1        0.01      100.00
-------------------+-----------------------------------
             Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 28 Mar 2016