Frequencies for first 10,000 rows of age variable in nhamcsopd1999 dataset :

    patient age in |
             years |      Freq.     Percent        Cum.
-------------------+-----------------------------------
    Under one year |        456        4.56        4.56
                 1 |        243        2.43        6.99
                 2 |        131        1.31        8.30
                 3 |        129        1.29        9.59
                 4 |        134        1.34       10.93
                 5 |        113        1.13       12.06
                 6 |        106        1.06       13.12
                 7 |         92        0.92       14.04
                 8 |        101        1.01       15.05
                 9 |         95        0.95       16.00
                10 |         89        0.89       16.89
                11 |         98        0.98       17.87
                12 |         89        0.89       18.76
                13 |         79        0.79       19.55
                14 |         86        0.86       20.41
                15 |        120        1.20       21.61
                16 |        126        1.26       22.87
                17 |        100        1.00       23.87
                18 |        124        1.24       25.11
                19 |        127        1.27       26.38
                20 |        154        1.54       27.92
                21 |        146        1.46       29.38
                22 |        156        1.56       30.94
                23 |        138        1.38       32.32
                24 |        162        1.62       33.94
                25 |        168        1.68       35.62
                26 |        138        1.38       37.00
                27 |        126        1.26       38.26
                28 |        152        1.52       39.78
                29 |        160        1.60       41.38
                30 |        175        1.75       43.13
                31 |        130        1.30       44.43
                32 |        146        1.46       45.89
                33 |        136        1.36       47.25
                34 |        162        1.62       48.87
                35 |        150        1.50       50.37
                36 |        157        1.57       51.94
                37 |        118        1.18       53.12
                38 |        137        1.37       54.49
                39 |        158        1.58       56.07
                40 |        152        1.52       57.59
                41 |        150        1.50       59.09
                42 |        122        1.22       60.31
                43 |        165        1.65       61.96
                44 |        124        1.24       63.20
                45 |        134        1.34       64.54
                46 |        125        1.25       65.79
                47 |        142        1.42       67.21
                48 |        125        1.25       68.46
                49 |        143        1.43       69.89
                50 |        135        1.35       71.24
                51 |        123        1.23       72.47
                52 |        148        1.48       73.95
                53 |        122        1.22       75.17
                54 |         97        0.97       76.14
                55 |         94        0.94       77.08
                56 |        140        1.40       78.48
                57 |        101        1.01       79.49
                58 |        115        1.15       80.64
                59 |        109        1.09       81.73
                60 |         82        0.82       82.55
                61 |         96        0.96       83.51
                62 |         76        0.76       84.27
                63 |         79        0.79       85.06
                64 |        110        1.10       86.16
                65 |         99        0.99       87.15
                66 |         82        0.82       87.97
                67 |         70        0.70       88.67
                68 |         76        0.76       89.43
                69 |         74        0.74       90.17
                70 |         73        0.73       90.90
                71 |         71        0.71       91.61
                72 |         93        0.93       92.54
                73 |         82        0.82       93.36
                74 |         69        0.69       94.05
                75 |         67        0.67       94.72
                76 |         62        0.62       95.34
                77 |         59        0.59       95.93
                78 |         36        0.36       96.29
                79 |         43        0.43       96.72
                80 |         35        0.35       97.07
                81 |         39        0.39       97.46
                82 |         61        0.61       98.07
                83 |         27        0.27       98.34
                84 |         35        0.35       98.69
                85 |         28        0.28       98.97
                86 |         21        0.21       99.18
                87 |         20        0.20       99.38
                88 |         17        0.17       99.55
                89 |         10        0.10       99.65
                90 |          6        0.06       99.71
                91 |         11        0.11       99.82
                92 |          4        0.04       99.86
                93 |          2        0.02       99.88
                94 |          4        0.04       99.92
                95 |          1        0.01       99.93
                96 |          2        0.02       99.95
                98 |          1        0.01       99.96
                99 |          3        0.03       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