Frequencies for first 10,000 rows of age variable in nhamcsopd1998 dataset :

    patient age in |
             years |      Freq.     Percent        Cum.
-------------------+-----------------------------------
    Under one year |        464        4.64        4.64
                 1 |        221        2.21        6.85
                 2 |        126        1.26        8.11
                 3 |         92        0.92        9.03
                 4 |        115        1.15       10.18
                 5 |        133        1.33       11.51
                 6 |         76        0.76       12.27
                 7 |        110        1.10       13.37
                 8 |        101        1.01       14.38
                 9 |         81        0.81       15.19
                10 |         82        0.82       16.01
                11 |         99        0.99       17.00
                12 |         97        0.97       17.97
                13 |         88        0.88       18.85
                14 |         94        0.94       19.79
                15 |         96        0.96       20.75
                16 |        111        1.11       21.86
                17 |        135        1.35       23.21
                18 |        145        1.45       24.66
                19 |        137        1.37       26.03
                20 |        141        1.41       27.44
                21 |        149        1.49       28.93
                22 |        128        1.28       30.21
                23 |        130        1.30       31.51
                24 |        149        1.49       33.00
                25 |        146        1.46       34.46
                26 |        154        1.54       36.00
                27 |        171        1.71       37.71
                28 |        173        1.73       39.44
                29 |        149        1.49       40.93
                30 |        139        1.39       42.32
                31 |        131        1.31       43.63
                32 |        151        1.51       45.14
                33 |        137        1.37       46.51
                34 |        156        1.56       48.07
                35 |        134        1.34       49.41
                36 |        169        1.69       51.10
                37 |        162        1.62       52.72
                38 |        136        1.36       54.08
                39 |        127        1.27       55.35
                40 |        155        1.55       56.90
                41 |        134        1.34       58.24
                42 |        114        1.14       59.38
                43 |        116        1.16       60.54
                44 |        132        1.32       61.86
                45 |        120        1.20       63.06
                46 |        119        1.19       64.25
                47 |        126        1.26       65.51
                48 |        129        1.29       66.80
                49 |        124        1.24       68.04
                50 |        121        1.21       69.25
                51 |        138        1.38       70.63
                52 |         94        0.94       71.57
                53 |        133        1.33       72.90
                54 |        126        1.26       74.16
                55 |        108        1.08       75.24
                56 |        143        1.43       76.67
                57 |         97        0.97       77.64
                58 |        103        1.03       78.67
                59 |        101        1.01       79.68
                60 |        111        1.11       80.79
                61 |         85        0.85       81.64
                62 |        114        1.14       82.78
                63 |         97        0.97       83.75
                64 |        111        1.11       84.86
                65 |         75        0.75       85.61
                66 |         99        0.99       86.60
                67 |        108        1.08       87.68
                68 |         94        0.94       88.62
                69 |         93        0.93       89.55
                70 |         80        0.80       90.35
                71 |         75        0.75       91.10
                72 |         89        0.89       91.99
                73 |         77        0.77       92.76
                74 |         79        0.79       93.55
                75 |         62        0.62       94.17
                76 |         79        0.79       94.96
                77 |         78        0.78       95.74
                78 |         50        0.50       96.24
                79 |         49        0.49       96.73
                80 |         47        0.47       97.20
                81 |         39        0.39       97.59
                82 |         36        0.36       97.95
                83 |         50        0.50       98.45
                84 |         34        0.34       98.79
                85 |         21        0.21       99.00
                86 |         23        0.23       99.23
                87 |         14        0.14       99.37
                88 |         17        0.17       99.54
                89 |          9        0.09       99.63
                90 |         11        0.11       99.74
                91 |          8        0.08       99.82
                92 |          4        0.04       99.86
                93 |          6        0.06       99.92
                94 |          1        0.01       99.93
                95 |          1        0.01       99.94
                96 |          3        0.03       99.97
                97 |          1        0.01       99.98
                98 |          1        0.01       99.99
                99 |          1        0.01      100.00
-------------------+-----------------------------------
             Total |     10,000      100.00

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