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Libri in offerta

Sommario generale dell’annata
Gratis
digital
formato: Articolo | STUDI DI SOCIOLOGIA - 2012 - 4
Anno: 2012
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La risurrezione dei morti
Gratis
digital
formato: Articolo | LA RIVISTA DEL CLERO ITALIANO - 2012 - 4
Anno: 2012
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Libri ricevuti
Gratis
digital
formato: Articolo | AEVUM - 2012 - 3
Anno: 2012
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Sommario generale dell’annata
Gratis
digital
formato: Articolo | AEVUM - 2012 - 3
Anno: 2012
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EDITORIALE: Scienza e fede insieme per l'uomo
Gratis
digital
formato: Articolo | VITA E PENSIERO - 2012 - 3
Anno: 2012
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Summaries
Gratis
digital
formato: Articolo | STUDI DI SOCIOLOGIA - 2012 - 3
Anno: 2012
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EDITORIALE: Tra gli ulivi del Getsemani
Gratis
digital
formato: Articolo | LA RIVISTA DEL CLERO ITALIANO - 2012 - 3
Anno: 2012
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Sommario generale dell’annata 2012
Gratis
digital
formato: Articolo | JUS - 2012 - 3
Anno: 2012
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Note biografiche - Biographical notes
Gratis
digital
formato: Articolo | COMUNICAZIONI SOCIALI - 2012 - 3. L'impulso autoetnografico. Radicamento e riflessività nell'era intermediale
Anno: 2012
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The Dagum distribution in reliability analisys
Gratis
digital
formato: Articolo | STATISTICA & APPLICAZIONI - 2012 - 2
Anno: 2012
SUMMARY This work proposes the use of the Dagum model (Dagum, 1977) in the reliability theory. The main motivation is that the hazard rate of this model is very flexible; in fact, it is proved (Domma, 2002) that, according to the values of the parameters, the hazard rate of the Dagum distribution has a decreasing, or an Upside-down Bathtub, or Bathtub and then Upside-down Bathtub failure rate. This work studies some features of the Dagum distribution as the reversed hazard rate, the mean and variance of the random variables residual life and reversed residual life and their monotonicity properties. Two published data sets have been analyzed for illustrative purposes. Keywords: Burr III distribution, Reversed Hazard Function, Mean Residual Life, Mean Waiting Time, Variance of Residual Life and Reversed Residual Life.
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Testing for preference change in marketing or opinion research
Gratis
digital
formato: Articolo | STATISTICA & APPLICAZIONI - 2012 - 2
Anno: 2012
SUMMARY Let us suppose we have two important products or parties or opinions indicated respectively by A and B and a pool of small other choices indicated by C and we are interested in understanding if the percentage of preferences for A and the percentage of preferences for B are unchanged, increased or decreased after some event (f.i. advertising). If the sample size is big, we propose to use a two stage hypotheses test proposed by Duncan (Miller, 1981) and improved by Pollastri (2008). The test considered is based on the exact distribution of the absolute maximum (Zenga, 1979) and on the exact distribution of the absolute minimum (Pollastri and Tornaghi, 2004) of the components of a Bivariate Correlated Normal. Tables of the critical values are reported. The test proposed allows to accept one of the nine hypotheses about the invariance or increasing or decreasing of the percentage of A combined with the three movements of the percentage of B. Keywords: Trinomial Distribution, Bivariate Correlated Normal, Two Stage Hypotheses Test, Absolute Maximum and Minimum.
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First applications of a new three-parameter distribution for non-negative variables
Gratis
digital
formato: Articolo | STATISTICA & APPLICAZIONI - 2012 - 2
Anno: 2012
SUMMARY Zenga (2010a) recently proposed a new three-parameter family of density functions for non-negative variables. Its properties resemble those of economic size distributions: it has positive asymmetry, Paretian right tail and it may be zeromodal, unimodal or even bimodal. In this paper we explore some methods for fitting the new density to empirical income distributions. We will see that D’Addario’s invariants method clearly outperforms Pearson’s moments method, which does not seem to work well with heavy tailed distributions. Further, we propose some new methods based on the minimization of a measure for the goodness of fit, imposing restrictions on the parameter space to preserve some features of the empirical distribution in the fitted model. We will see that these methods provide very satisfactory results with income distributions from Italy, Swiss, US and UK. Keywords: Income Distribution, Zenga’s Distribution, Goodness of Fit, Moments Method, Invariants Method.
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La Grande Guerra a Cortina d'Ampezzo
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La mafia si combatte anche con la ricerca
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L'Europa dei Libri, i nostri consigli per l'estate 2018
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Gli insegnanti in Italia: radiografia di una professone
Intervista a Maddalena Colombo, sociologa dei processi culturali, e autrice di un libro che racconta gli insegnati di oggi, tra difficoltà e ideali.

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