On the problem of inference for inequality measures for heavy-tailed distributions
On the problem of inference for inequality measures for heavy-tailed distributions
We consider the class of heavy-tailed income distributions and show that the shape of the income distribution has a strong effect on inference for inequality measures. In particular, we demonstrate how the severity of the inference problem responds to the exact nature of the right tail of the income distribution. It is shown that the density of the studentised inequality measure is heavily skewed to the left, and that the excessive coverage failures of the usual confidence intervals are associated with excessively low estimates of both the point measure and the variance. For further diagnostics, the coefficients of bias, skewness and kurtosis are derived and examined for both studentised and standardised inequality measures. These coefficients are also used to correct the size of confidence intervals. Exploiting the uncovered systematic relationship between the inequality estimate and its estimated variance, variance stabilising transforms are proposed and shown to improve inference significantly.
inequality measures, inference, statistical performance, asymptotic expansions, variance stabilisation
125-153
Schluter, Christian
ae043254-4cc4-48aa-abad-56a36554de2b
February 2012
Schluter, Christian
ae043254-4cc4-48aa-abad-56a36554de2b
Schluter, Christian
(2012)
On the problem of inference for inequality measures for heavy-tailed distributions.
The Econometrics Journal, 15 (1), .
(doi:10.1111/j.1368-423X.2011.00356.x).
Abstract
We consider the class of heavy-tailed income distributions and show that the shape of the income distribution has a strong effect on inference for inequality measures. In particular, we demonstrate how the severity of the inference problem responds to the exact nature of the right tail of the income distribution. It is shown that the density of the studentised inequality measure is heavily skewed to the left, and that the excessive coverage failures of the usual confidence intervals are associated with excessively low estimates of both the point measure and the variance. For further diagnostics, the coefficients of bias, skewness and kurtosis are derived and examined for both studentised and standardised inequality measures. These coefficients are also used to correct the size of confidence intervals. Exploiting the uncovered systematic relationship between the inequality estimate and its estimated variance, variance stabilising transforms are proposed and shown to improve inference significantly.
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e-pub ahead of print date: 16 February 2012
Published date: February 2012
Keywords:
inequality measures, inference, statistical performance, asymptotic expansions, variance stabilisation
Organisations:
Economics
Identifiers
Local EPrints ID: 154445
URI: http://eprints.soton.ac.uk/id/eprint/154445
ISSN: 1368-4221
PURE UUID: 898f5b8d-969d-4eb7-a933-60828ee35570
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Date deposited: 25 May 2010 14:39
Last modified: 14 Mar 2024 01:34
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