[R] create groups from tallies

[Jeff D. Hamann]

I'm trying to figure out a way of grouping data from simple tally data. For
example, I would like to turn the following table into the table at the
bottom. I would normally do this in sql statements, but I won't have control
over the data, so that's not an option...

Thanks,
Jeff.

dbh, tally
5 1
12 2
6 1
10 1
6 1
12 1
10 2
9 1
3 1
5 1
8 1
3 1
6 1
5 1
10 1
5 1
4 1
22 1
20 1
15 1
14 1
11 1
15 1
10 1
8 1
14 1
10 1
11 1
16 1
17 1
10 1
12 1
9 1
6 1
11 1
18 1
7 1
8 1
9 1
12 1
13 1
14 1
16 1
15 1
8 1
35 1
5 1
8 1
14 1
11 1
12 1
20 1
10 1
27 1
7 1
8 2
12 2
5 1
20 1
12 1
17 1
22 1
10 1
13 1
9 1
27 1
9 1
18 1
12 1
15 2
18 1
22 1
16 1
17 1
11 1
15 1
8 1
14 1
18 1
11 1
14 1
9 1
14 1
8 1
9 1
10 1
20 1
11 1
10 1
6 1
10 1
16 1
8 2
14 2
7 1
5 1
8 1
15 1
13 2
13 1
15 1
9 2
16 1
18 1
12 1
10 1
17 1
15 1
7 1
17 1
20 1
5 1
7 1
6 1
7 1
4 1
8 1
7 1
4 1
16 1
6 1
5 1
3 1
5 1
17 1
6 1
13 1
10 1
6 1
7 1
9 1
5 1
6 1
9 1
22 1
2 1
8 1
5 1
14 1
12 1
14 1
9 2
19 1
18 1
17 1
23 1
21 1
22 1
16 1
15 1
13 1
9 1
14 1
11 1
19 1
19 1
20 1
25 1
22 1
22 1
17 1
24 1
15 1
8 1
3 1
6 1
7 1
11 1
11 1
11 1
5 1
19 1
16 1
12 1
9 1
16 1
13 1
12 1
18 1
18 1
19 1
11 1
12 1
11 1
13 1
13 1
12 1
10 1
15 1
6 1
11 1
9 1
8 1
7 1
12 1
15 1
15 1
12 1
17 1
17 1
20 1
9 1
8 1
16 1
19 1
25 1
22 1
23 1
21 1
23 1
19 1
8 1
16 1
10 1
16 1
11 1
11 1
10 1
13 1
17 1
15 1
6 1
23 1
21 1
12 1
14 1
17 1
17 1
12 1
12 1
14 1
17 1
17 1
11 1
13 1
19 1
27 1
10 1
33 1
9 1
10 1
15 1
12 1
11 1
8 1
8 1
10 1
7 1
10 1
12 1
9 1
12 1
7 1
10 1
9 1
11 1
12 1
10 1
10 1
11 1
16 1
13 1
8 1
17 1
15 1
19 1
16 1
12 1
7 1
11 1
15 1
15 1
14 1
14 1
8 1
6 1
7 1
23 1
4 1
4 1
7 1
6 1
9 1
10 1
15 1
23 1
8 1
13 1
8 1
21 1
24 1
22 1
8 1
14 1
24 1
13 1
17 1
9 1
25 1
9 1
22 1
7 1
20 1
13 2
15 1
9 1
17 1
13 1
18 1
9 1
19 1
7 1
14 1
15 1
9 1
16 1
12 1
7 1
9 1
11 1
23 1
8 1
19 1
10 1
23 1
6 1
28 1
32 1
9 1
6 1
27 1
14 1
18 1
11 1
14 1
10 1
15 1
9 1
21 1
23 1
16 2
19 1
22 1
16 1
13 1
11 1
29 1


"dbh","SumOftally"
2,1.00
3,4.00
4,5.00
5,13.00
6,17.00
7,18.00
8,26.00
9,29.00
10,27.00
11,24.00
12,27.00
13,19.00
14,20.00
15,23.00
16,18.00
17,18.00
18,10.00
19,12.00
20,8.00
21,5.00
22,11.00
23,9.00
24,3.00
25,3.00
27,4.00
28,1.00
29,1.00
32,1.00
33,1.00
35,1.00