Gini Calculation

	A	B	C	D	E	F	H	I	J	K	L	M
1		Perfect Equality					Observed Distribution
2				Cumulative fraction of income					Cumulative fraction of income
3	Group	Percentile of Distribution	Percent of all income earned by this group	Perfect Equality	Midpoint	Approximate Area	Percentile of Distribution	Percent of all income earned by this group	Observed Distribution	Midpoint	Approximate Area
4		0	0	0.00%			0	0	0.00%
5	A	20	20	20.00%	0.1	2	20	1	1.00%	0.005	0.1
6	B	40	20	40.00%	0.3	6	40	4	5.00%	0.03	0.6
7	C	60	20	60.00%	0.5	10	60	7	12.00%	0.085	1.7
8	D	80	20	80.00%	0.7	14	80	20	32.00%	0.22	4.4
9	E	100	20	100.00%	0.9	18	100	68	100.00%	0.66	13.2
10			100			50		100			20	30
11
12												Area A = 30
13											Gini	Gini Coefficient = 0.6
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100