Vita e Pensiero
Counting and enumerating frequency tables with given margins
digital
Year:
2003
Consider the integral m × n table X whose entries are count data for a two-way classification scheme. We shall be concerned first with the problem of counting up, then of enumerating all contingency tables with given margins.
Miscugli meno favorevoli
digital
Year:
2003
The aim of this paper is to prove a property of mixtures from which follows Lehmann-Stein Theorem (1948) connecting least favorable mixtures with most powerful tests.
On the decomposition by subpopulations of the point and synthetic
Bonferroni inequality measures
digital
Year:
2016
This paper, by using the ‘‘two-step’’ approach proposed in Radaelli (2008, 2010) and in Zenga (2016) for the decomposition of the Zenga (2007) index, obtains the decomposition of the Bonferroni (1930) inequality measure. In the first step the Bonferroni point measure Vh(Y) is decomposed in a weighted mean of k x k relative differences between the mean Mg(Y) of subpopulation g and the lower mean Mhl(Y) of the subpopulation l...
Using IRT models to quantify the strengths and difficulties
questionnaire (SDQ) outcomes
digital
Year:
2016
Over the past decades an increasing number of studies have focused on the importance of behavioural problems of school children. Often, the assessment of children’s behavioural and emotional problems has been carried out using the Strengths and Difficulties Questionnaire (SDQ). This paper analyses the parents’ and teachers’ scores of SDQ for a sample of children aged 6 to 10 years who participated in a karate project in a public school...
Decomposition by subpopulations of the point and the synthetic
Gini inequality indexes
digital
Year:
2016
Keywords: Gini Index, Point Inequality Index, Synthetic Inequality Index, Decomposition by Subpopulatios
Forecasting the steel product prices with the ARIMA model
digital
Year:
2016
The following paper describes the results of the forecast activity applied on steel prices time series, the method used in this analysis is a rolling window ARIMA regression. The forecast activity is built on prices time series that have been collected by anonymous weekly surveys sent to a sample of steel Italian operators...
Asymptotic properties of some estimators for Gini and Zenga
inequality measures: a simulation study
digital
Year:
2015
It is well known that unequal income distribution, yielding poverty, stratification and polarization, can be a serious economic and social problem. The reliable inequality analysis of both, total population of households and subpopulations classified by different characteristics, can be a helpful piece of information for economists and social policy- makers. Therefore, it seems especially important to present reliable estimates of income inequality measures for a population of households in different divisions...
Joint decomposition by subpopulations and sources of the Zenga
inequality index I(Y)
digital
Year:
2015
Keywords: Zenga Inequality Index, Income Inequality, Joint Decomposition by Subpopulations and Sources, Point and Synthetic Inequality Indexes.
Bipolar distributions in fuzzy sets theory
digital
Year:
2015
In this paper we consider the problem of measuring latent variables with ordinal scales and we put forward an original approach to this issue, which combines the use of Intuitionistic Fuzzy Sets with the calculation of bipolar means and bipolar distributions. Intuitionistic Fuzzy theory allows a researcher to model the degree of membership and non-membership to a certain fuzzy set, as well as the residual uncertainty...
Tests and confidence intervals for geometric mean from one and
two populations: a unified approach
digital
Year:
2015
The geometric mean is a type of mean which indicates the central tendency of a set of numbers by using the product of their values and has many applications in several fields such as proportional growth, signal processing and spectral flatness...
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