Frequencies for first 10,000 rows of age variable in nhamcsopd1997 dataset :

    patient age in |
             years |      Freq.     Percent        Cum.
-------------------+-----------------------------------
    Under one year |        432        4.32        4.32
                 1 |        236        2.36        6.68
                 2 |        139        1.39        8.07
                 3 |        128        1.28        9.35
                 4 |        117        1.17       10.52
                 5 |         97        0.97       11.49
                 6 |         85        0.85       12.34
                 7 |         83        0.83       13.17
                 8 |         80        0.80       13.97
                 9 |         76        0.76       14.73
                10 |         80        0.80       15.53
                11 |         81        0.81       16.34
                12 |         77        0.77       17.11
                13 |         82        0.82       17.93
                14 |         75        0.75       18.68
                15 |         89        0.89       19.57
                16 |        119        1.19       20.76
                17 |        139        1.39       22.15
                18 |        136        1.36       23.51
                19 |        154        1.54       25.05
                20 |        130        1.30       26.35
                21 |        142        1.42       27.77
                22 |        141        1.41       29.18
                23 |        181        1.81       30.99
                24 |        132        1.32       32.31
                25 |        165        1.65       33.96
                26 |        164        1.64       35.60
                27 |        159        1.59       37.19
                28 |        134        1.34       38.53
                29 |        150        1.50       40.03
                30 |        156        1.56       41.59
                31 |        159        1.59       43.18
                32 |        159        1.59       44.77
                33 |        170        1.70       46.47
                34 |        161        1.61       48.08
                35 |        134        1.34       49.42
                36 |        141        1.41       50.83
                37 |        168        1.68       52.51
                38 |        132        1.32       53.83
                39 |        151        1.51       55.34
                40 |        151        1.51       56.85
                41 |        156        1.56       58.41
                42 |        166        1.66       60.07
                43 |        132        1.32       61.39
                44 |        139        1.39       62.78
                45 |        140        1.40       64.18
                46 |        156        1.56       65.74
                47 |        123        1.23       66.97
                48 |        132        1.32       68.29
                49 |        145        1.45       69.74
                50 |        156        1.56       71.30
                51 |        112        1.12       72.42
                52 |        106        1.06       73.48
                53 |        117        1.17       74.65
                54 |        152        1.52       76.17
                55 |        115        1.15       77.32
                56 |         95        0.95       78.27
                57 |        124        1.24       79.51
                58 |        119        1.19       80.70
                59 |        105        1.05       81.75
                60 |         99        0.99       82.74
                61 |         95        0.95       83.69
                62 |         95        0.95       84.64
                63 |        108        1.08       85.72
                64 |         93        0.93       86.65
                65 |        102        1.02       87.67
                66 |        100        1.00       88.67
                67 |         77        0.77       89.44
                68 |         85        0.85       90.29
                69 |         70        0.70       90.99
                70 |         80        0.80       91.79
                71 |         67        0.67       92.46
                72 |         76        0.76       93.22
                73 |         66        0.66       93.88
                74 |         62        0.62       94.50
                75 |         50        0.50       95.00
                76 |         57        0.57       95.57
                77 |         46        0.46       96.03
                78 |         66        0.66       96.69
                79 |         49        0.49       97.18
                80 |         42        0.42       97.60
                81 |         41        0.41       98.01
                82 |         43        0.43       98.44
                83 |         18        0.18       98.62
                84 |         17        0.17       98.79
                85 |         14        0.14       98.93
                86 |         18        0.18       99.11
                87 |         17        0.17       99.28
                88 |         14        0.14       99.42
                89 |         15        0.15       99.57
                90 |         12        0.12       99.69
                91 |          3        0.03       99.72
                92 |          4        0.04       99.76
                93 |          5        0.05       99.81
                94 |          5        0.05       99.86
                95 |          3        0.03       99.89
                96 |          5        0.05       99.94
                97 |          2        0.02       99.96
                99 |          2        0.02       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