Vita e Pensiero

Pisa 2000 cognitive data on reading and mathematical literacy of the Italian 15 year-old students have been analysed applying multilevel statistical methods to estimate the Italian school effectiveness...

The paper deals with non linear dimension reduction methods in presence of ordinal data.

The aim of this paper is twofold: firstly to point out the inadequacy of the “Kappa” statistic in the context of University Student Satisfaction; secondly to propose a procedure for assessing and testing agreement among multiple raters which is based on a statistic not affected by “Kappa” paradoxes.

The paper considers the CS in its own nature of interval value and proposes to apply fuzzy regression models for the CS estimation.

Primo fascicolo del 2005

This paper proposes, for ordinal variables, a new type of mean called bipolar mean, that is a frequency distribution with the total size n concentrated on one category or on two consecutive categories.

In this paper we compare the accuracy of three packages that are commonly used for statistical calculations: Excel of Microsoft, version XP Edition 2003, Statistica of Statsoft, version 6, and R, an open-source free software, available on the web, version 1.9.0.

This work presents a continuous characters classification tecnique, which satisfies some optimality criterion, such as the maximisation of the variance “between” or the minimisation of the concentration “within” the groups, measured by some index which admits a decomposition.