Frequencies for first 10,000 rows of age variable in nhamcsopd2001 dataset :

    patient age in |
             years |      Freq.     Percent        Cum.
-------------------+-----------------------------------
    Under one year |        525        5.25        5.25
                 1 |        305        3.05        8.30
                 2 |        178        1.78       10.08
                 3 |        147        1.47       11.55
                 4 |        125        1.25       12.80
                 5 |        111        1.11       13.91
                 6 |        104        1.04       14.95
                 7 |        112        1.12       16.07
                 8 |        101        1.01       17.08
                 9 |         90        0.90       17.98
                10 |         84        0.84       18.82
                11 |         90        0.90       19.72
                12 |         83        0.83       20.55
                13 |        104        1.04       21.59
                14 |         92        0.92       22.51
                15 |        119        1.19       23.70
                16 |         97        0.97       24.67
                17 |        106        1.06       25.73
                18 |        118        1.18       26.91
                19 |        114        1.14       28.05
                20 |        121        1.21       29.26
                21 |        137        1.37       30.63
                22 |        121        1.21       31.84
                23 |        121        1.21       33.05
                24 |        144        1.44       34.49
                25 |        139        1.39       35.88
                26 |        134        1.34       37.22
                27 |        120        1.20       38.42
                28 |        133        1.33       39.75
                29 |        122        1.22       40.97
                30 |        153        1.53       42.50
                31 |        124        1.24       43.74
                32 |        150        1.50       45.24
                33 |        119        1.19       46.43
                34 |        138        1.38       47.81
                35 |        130        1.30       49.11
                36 |        145        1.45       50.56
                37 |        139        1.39       51.95
                38 |        140        1.40       53.35
                39 |        132        1.32       54.67
                40 |        135        1.35       56.02
                41 |        147        1.47       57.49
                42 |        135        1.35       58.84
                43 |        137        1.37       60.21
                44 |        147        1.47       61.68
                45 |        136        1.36       63.04
                46 |        146        1.46       64.50
                47 |        145        1.45       65.95
                48 |        142        1.42       67.37
                49 |        181        1.81       69.18
                50 |        152        1.52       70.70
                51 |        149        1.49       72.19
                52 |        152        1.52       73.71
                53 |        136        1.36       75.07
                54 |        128        1.28       76.35
                55 |        137        1.37       77.72
                56 |        106        1.06       78.78
                57 |        103        1.03       79.81
                58 |        119        1.19       81.00
                59 |        128        1.28       82.28
                60 |        121        1.21       83.49
                61 |         99        0.99       84.48
                62 |        123        1.23       85.71
                63 |         87        0.87       86.58
                64 |         78        0.78       87.36
                65 |         95        0.95       88.31
                66 |         88        0.88       89.19
                67 |         77        0.77       89.96
                68 |         88        0.88       90.84
                69 |         66        0.66       91.50
                70 |         82        0.82       92.32
                71 |         83        0.83       93.15
                72 |         75        0.75       93.90
                73 |         84        0.84       94.74
                74 |         51        0.51       95.25
                75 |         56        0.56       95.81
                76 |         51        0.51       96.32
                77 |         51        0.51       96.83
                78 |         36        0.36       97.19
                79 |         40        0.40       97.59
                80 |         32        0.32       97.91
                81 |         36        0.36       98.27
                82 |         40        0.40       98.67
                83 |         25        0.25       98.92
                84 |         16        0.16       99.08
                85 |         15        0.15       99.23
                86 |         18        0.18       99.41
                87 |         15        0.15       99.56
                88 |         15        0.15       99.71
                89 |          8        0.08       99.79
                90 |          5        0.05       99.84
                91 |          4        0.04       99.88
                93 |          3        0.03       99.91
                94 |          3        0.03       99.94
                95 |          2        0.02       99.96
                96 |          1        0.01       99.97
                99 |          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