Example of Cyclomatic complexity analysis over real projects

Processed by:

1) launch of https://github.com/checkstyle/contribution/tree/master/checkstyle-tester generate HTML report

2) html2text target/site/index.html | grep "Cyclomatic Complexity is" | cut -d' ' -f7 | sort | uniq --count | sort -h -k 2

3) % is calculated as "=TRUNC(((B2)/B$47)*100)"

So amount of methods the complicated then 10 (from all method that complicated than 5) in the project is about 5%.  Below is tables for: Checkstyle , Spring Framework, Open JDK 7.

Checkstyle 6.7 Cynclomatic complexity analysis:

CC	Count	%
5	130	15
6	83	12
7	66	9
8	52	10
9	53	4
10	22	4
11	23	4
12	25	1
13	7	0
14	3	1
15	8	0
16	4	0
17	2	0
18	5	1
19	10	0
20	1	2
21	13	0
22	1	0
23	5	0
24	1	0
27	1	0
29	1	0
30	1	0
32	1	0
34	2	0
44	2	0
47	2	0
81	1	100
	Total: 525

Spring frameworks v4.1.6.RELEASE Cyclomatic complexity analysis:

CC	Count	%
5	746	30
6	450	18
7	312	12
8	215	8
9	157	6
10	109	4
11	80	3
12	55	2
13	52	2
14	34	1
15	33	1
16	25	1
17	18	0
18	19	0
19	14	0
20	17	0
21	11	0
22	8	0
23	9	0
24	6	0
25	7	0
26	11	0
27	1	0
28	2	0
29	1	0
31	3	0
32	2	0
33	5	0
34	3	0
35	2	0
36	3	0
37	1	0
38	1	0
40	2	0
41	1	0
44	1	0
47	1	0
48	1	0
50	2	0
55	1	0
60	1	0
61	1	0
81	2	0
127	1	0
184	1	0
	Total:2427

OpenJdk7 Cyclomatic complexity analysis: 

CC	Count	%
5	4650	25
6	2947	16
7	2234	12
8	1542	8
9	1161	6
10	932	5
11	706	3
12	574	3
13	505	2
14	383	2
15	332	1
16	261	1
17	230	1
18	200	1
19	183	1
20	128	0
21	119	0
22	121	0
23	102	0
24	78	0
25	58	0
26	60	0
27	57	0
28	47	0
29	30	0
30	29	0
31	27	0
32	30	0
33	22	0
34	30	0
35	11	0
36	19	0
37	27	0
38	12	0
39	17	0
40	10	0
41	16	0
42	12	0
43	11	0
44	14	0
45	6	0
46	11	0
47	14	0
48	9	0
49	7	0
50	12	0
51	11	0
52	6	0
53	6	0
54	8	0
55	6	0
56	5	0
57	2	0
58	4	0
59	1	0
60	3	0
62	6	0
63	3	0
64	4	0
66	4	0
67	6	0
68	2	0
69	1	0
70	2	0
71	1	0
72	2	0
73	3	0
74	7	0
75	4	0
76	3	0
77	3	0
78	2	0
79	1	0
80	4	0
81	1	0
82	5	0
83	1	0
85	1	0
86	2	0
87	1	0
88	3	0
93	2	0
95	3	0
96	1	0
97	1	0
100	1	0
101	1	0
103	1	0
109	1	0
110	1	0
111	1	0
121	1	0
124	1	0
125	1	0
130	2	0
140	1	0
145	1	0
149	1	0
164	1	0
186	1	0
219	1	0
256	1	0
281	1	0
	Total:18136