Showing 1 - 10 of 50
In this paper, we discuss one of the reasons leading practitionners to the rejection of the Markowitz model and propose a new stastistical method to avoid this problem. To be more precise, we discuss the problem of statistical robustness of the Markowitz optimizer and show that the latter is not...
Persistent link: https://www.econbiz.de/10005779578
Poverty analysis in Tunisia so far depends heavily upon the choice of poverty lines. In this paper we propose to adopt an approach based on the determination of regional basic needs in order to estimte the differential between urban and rural lines. In order to get stable results we also propose...
Persistent link: https://www.econbiz.de/10005780401
Distributional dominance criteria are commonly applied to draw welfare inferences about comparisons, but conclusions drawn from empirical implementations of dominance criteria may be influenced by data contamination. We examine a non-parametric approach to refining Lorenz-type comparisons and...
Persistent link: https://www.econbiz.de/10005510522
Modelling Lorenz curves (LC) for stochastic dominance comparisons is central to the analysis of income distribution. It is conventional to use non-parametric statistics based on empirical income cumulants which are in the construction of LC and other related second-order dominance criteria....
Persistent link: https://www.econbiz.de/10005510533
Lorenz curves and associated tools for ranking income distributions are commonly estimated on the assumption that full, unbiased samples are available. However, it is common to find income and wealth distributions that are routinely censored or trimmed. We derive the sampling distribution for a...
Persistent link: https://www.econbiz.de/10005510539
Persistent link: https://www.econbiz.de/10005430011
This article presents a new estimation method for the parameters of a time series model. We consider here composite Gaussian processes that are the sum of independent Gaussian processes which, in turn, explain an important aspect of the time series, as is the case in engineering and natural...
Persistent link: https://www.econbiz.de/10010824043
Distributional dominance criteria are commonly applied to draw welfare in- ferences about comparisons, but conclusions drawn from empirical imple- mentations of dominance criteria may be inßuenced by data contamination. We examine a non-parametric approach to reÞning Lorenz-type comparisons...
Persistent link: https://www.econbiz.de/10011071290
With income distributions it is common to encounter the problem of missing data. When a parametric model is fitted to the data, the problem can be overcome by specifying the marginal distribution of the observed data. With classical methods of estimation such as the maximum likelihood (ML) an...
Persistent link: https://www.econbiz.de/10010928590
Inequality measures are often used to summarise information about empirical income distributions. However , the resulting picture of the distribution and of the changes in the distribution can be severely distorted if the data are contaminated. The nature of this distortion will in general...
Persistent link: https://www.econbiz.de/10010928608