
Hello R-experts,

I have a set of data as follows:

    age time
1   28    1
2   53    2
3   53    3
4   36    4
5   54    4
6   46    4
7   45    5
8   31    6
9   53    7
10  35    7
11  62    8
12  19    8
13  43    2
14  51    3
15  45    0
16  48    2
17  49    3
18  57    2
19  45    3
20  27   10
21  33   12
22  29   14
23  46   16
24  45   19
25  43    2
26  28    6
27  50    7
28  28    4
29  33    5
30  56    6
31  52    6
32  50    7


I want to group the data.

Where the age coloum will be grouped in to 0-15, 15-20 ...
and the sum of time of that group will be added to that group
instead of count of number with in that group.


Thank you for any help

With Regards
Subhabrata Pal
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