Frequencies for first 10,000 rows of age variable in nhamcsopd2009 dataset :

    patient age in |
             years |      Freq.     Percent        Cum.
-------------------+-----------------------------------
    under one year |        405        4.05        4.05
                 1 |        206        2.06        6.11
                 2 |        131        1.31        7.42
                 3 |        104        1.04        8.46
                 4 |         99        0.99        9.45
                 5 |         86        0.86       10.31
                 6 |         91        0.91       11.22
                 7 |         75        0.75       11.97
                 8 |         69        0.69       12.66
                 9 |         79        0.79       13.45
                10 |         73        0.73       14.18
                11 |         71        0.71       14.89
                12 |         78        0.78       15.67
                13 |         62        0.62       16.29
                14 |         74        0.74       17.03
                15 |         80        0.80       17.83
                16 |         90        0.90       18.73
                17 |        104        1.04       19.77
                18 |        119        1.19       20.96
                19 |        117        1.17       22.13
                20 |        144        1.44       23.57
                21 |        121        1.21       24.78
                22 |        148        1.48       26.26
                23 |        128        1.28       27.54
                24 |        136        1.36       28.90
                25 |        121        1.21       30.11
                26 |        141        1.41       31.52
                27 |        147        1.47       32.99
                28 |        145        1.45       34.44
                29 |        170        1.70       36.14
                30 |        128        1.28       37.42
                31 |        127        1.27       38.69
                32 |        113        1.13       39.82
                33 |        128        1.28       41.10
                34 |        108        1.08       42.18
                35 |        114        1.14       43.32
                36 |        121        1.21       44.53
                37 |        132        1.32       45.85
                38 |        126        1.26       47.11
                39 |        101        1.01       48.12
                40 |        121        1.21       49.33
                41 |        105        1.05       50.38
                42 |        120        1.20       51.58
                43 |        142        1.42       53.00
                44 |        134        1.34       54.34
                45 |        126        1.26       55.60
                46 |        131        1.31       56.91
                47 |        141        1.41       58.32
                48 |        184        1.84       60.16
                49 |        176        1.76       61.92
                50 |        142        1.42       63.34
                51 |        152        1.52       64.86
                52 |        175        1.75       66.61
                53 |        164        1.64       68.25
                54 |        161        1.61       69.86
                55 |        173        1.73       71.59
                56 |        173        1.73       73.32
                57 |        158        1.58       74.90
                58 |        163        1.63       76.53
                59 |        128        1.28       77.81
                60 |        132        1.32       79.13
                61 |        154        1.54       80.67
                62 |        143        1.43       82.10
                63 |        138        1.38       83.48
                64 |        102        1.02       84.50
                65 |        107        1.07       85.57
                66 |         94        0.94       86.51
                67 |         93        0.93       87.44
                68 |         87        0.87       88.31
                69 |         89        0.89       89.20
                70 |         79        0.79       89.99
                71 |         95        0.95       90.94
                72 |         74        0.74       91.68
                73 |         71        0.71       92.39
                74 |         60        0.60       92.99
                75 |         72        0.72       93.71
                76 |         56        0.56       94.27
                77 |         49        0.49       94.76
                78 |         73        0.73       95.49
                79 |         50        0.50       95.99
                80 |         38        0.38       96.37
                81 |         47        0.47       96.84
                82 |         62        0.62       97.46
                83 |         58        0.58       98.04
                84 |         36        0.36       98.40
                85 |         26        0.26       98.66
                86 |         27        0.27       98.93
                87 |         27        0.27       99.20
                88 |         20        0.20       99.40
                89 |         15        0.15       99.55
                90 |         10        0.10       99.65
                91 |         12        0.12       99.77
                92 |          5        0.05       99.82
                93 |          4        0.04       99.86
                94 |          4        0.04       99.90
                95 |          2        0.02       99.92
                96 |          4        0.04       99.96
                97 |          1        0.01       99.97
                98 |          1        0.01       99.98
100 years and over |          2        0.02      100.00
-------------------+-----------------------------------
             Total |     10,000      100.00

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