Zenga's New Index of Economic Inequality, Its Estimation, and an Analysis of Incomes in Italy

Table 4

95% confidence intervals for the difference of the Zenga indices between 2006 and 2004 in the Italian income distribution.

Northwest (926 pairs)			Northeast (841 pairs)		Center (831 pairs)
𝑍^𝑛(2006)		0.5797	𝑍^𝑛(2006)	0.6199	𝑍^𝑛(2006)	0.5921
𝑍^𝑛(2004)		0.5955	𝑍^𝑛(2004)	0.6474	𝑍^𝑛(2004)	0.5766
Difference		−0.0158	Difference	−0.0275	Difference	0.0155
	Lower	Upper	Lower	Upper	Lower	Upper
Normal	−0.0426	0.0102	−0.0573	0.0003	−0.0183	0.0514
Student	−0.0463	0.0103	−0.0591	0.0017	−0.0156	0.0644
Percent	−0.0421	0.0108	−0.0537	0.0040	−0.0183	0.0505
BCa	−0.0440	0.0087	−0.0551	0.0022	−0.0130	0.0593
South (843 pairs)			Islands (512 pairs)		Italy (3953 pairs)
𝑍^𝑛(2006)		0.6200	𝑍^𝑛(2006)	0.6179	𝑍^𝑛(2006)	0.6362
𝑍^𝑛(2004)		0.6325	𝑍^𝑛(2004)	0.6239	𝑍^𝑛(2004)	0.6485
Difference		−0.0125	Difference	−0.0060	Difference	−0.0123
	Lower	Upper	Lower	Upper	Lower	Upper
Normal	−0.0372	0.0129	−0.0333	0.0213	−0.0259	0.0007
Student	−0.0365	0.0166	−0.0351	0.0222	−0.0264	0.0013
Percent	−0.0372	0.0131	−0.0333	0.0214	−0.0253	0.0016
BCa	−0.0351	0.0162	−0.0331	0.0216	−0.0255	0.0013