An operative extension of the likelihood ratio test from fuzzy data

In the present paper we are going to extend the likelihood ratio test to the case in which the available experimental information involves fuzzy imprecision (more precisely, the observable events associated with the random experiment concerning the test may be characterized as fuzzy subsets of the sample space, as intended by Zadeh, 1965). In addition, we will approximate the immediate intractable extension, which is based on Zadeh’s probabilistic definition, by using the minimum inaccuracy principle of estimation from fuzzy data, that has been introduced in previous papers as an operative extension of the maximum likelihood method.     

Birth control in the early stage of marriage

Results are presented from a 1985 survey containing questions on family planning conducted among 13,392 newly married couples in Poland during the period from two to six months following marriage. The opinions of husbands and wives concerning various methods of contraception are analyzed.     

Bayesian sequential methods for choosing the best multinomial cell: some simulation results

Suboptimal Bayesian sequential methods for choosing the best (i.e. largest probability) multinomial cell are considered and their performance is studied using Monte Carlo simulation. Performance characteristics, such as the probability of correct selection and some other associated with the sample size distribution, are evaluated assuming a maximum sample size. Single observation sequential rules as well as rules, where groups of observations are taken, and fixed sample size rules are discussed.     

On a conjecture of Kakosyan,Klebanov and Melamed

Suppose X₁, X₂, ..., X_m is a random sample of size m from a population with probability density function f(x), x>0 and let X_1,m<...m,m be the corresponding order statistics. We assume m as an integer valued random variable with P(m=k)=p(1?p)^k?1, k=1, 2, ... and 0 and n X_1,n for fixed n characterizes the exponential distribution. In this paper we prove that under the assumption of monotone hazard rate the identical distribution of and (n?r+1) (X_r,n?X_r?1,n) for some fixed r and n with 1≤r≤n, n≥2, X_0,n=0, characterizes the exponential distribution. Under the assumption of monotone hazard rate the conjecture of Kakosyan, Klebanov and Melamed follows from the above result with r=1.     

An intelligent system for experimental design-some ideas

There is a growing movement towards the construction of statistical expert systems by statisticians to assist incertain aspects of their work. As one of the most'abused’ areas, experimental design could benefit from a system ofthis type. This paperoutlines some ideas on how a system for intelligently constructing designs could be built.     

Symbolic correlation integral

This paper aims to introduce the concept of symbolic correlation integral SC that is extensively used in many scientific fields. The new correlation integral SC avoids the noisy parameter 𝜀 of the classical correlation integral, defined by Grassberger and Procaccia (1983 Grassberger, P., Procaccia, I. (1983). Measuring the strangeness of strange attractors. Physica D: Nonlinear Phenomena 9(1–2):189–208.[Crossref], [Web of Science ®] , [Google Scholar]) and extensively used for constructing correlation-integral-based statistics, as in the BDS test. Once the free parameter 𝜀 disappears, it is possible to construct a nonparametric powerful test for independence that can also be used as a diagnostic tool for model selection. The symbolic correlation integral is also extended to deal with multivariate models, and a test for causality is proposed as an example of the theoretical power of the new concept. With extensive Monte Carlo simulations, the paper shows the good size and power performance of symbolic correlation-integral-based tests.     

Circulating pictures: photography and exhibition in the Portuguese Pavilion at Expo 58

This article examines the interplay between photography and universal exhibitions, two modern phenomena which, in different ways, have allowed for the world to be seen and reconfigured in unprecedented ways. It considers world exhibitions not just as sites of movement but also as systems that crucially rely on the circulation of photographic images. Focusing on a specific, and so far unexamined, case study – the Pavilion of Portugal at Brussels Expo 58 –, this work combines historical reconstruction and critical analysis to demonstrate how photography and exhibitions are mutually affected and transformed by the contexts in which they are made available. Particular attention is paid to the way humanism has been photographically integrated into the national discourse, and to the role invisibility plays in both exhibition and propaganda processes. Moreover, it is argued that despite the profusion and impressive scale of the photomurals in the pavilion, photography occupied a significantly subordinate role in the broad exhibition programme. Investigating how photographs functioned at different levels and purposes, before, during and after the exhibition, this article excavates several discourses, networks, and photo-textual interactions, to evidence how the history of photography and the history of exhibitions are often inseparable from one another.     

Enacting reflective and deliberative practices in action research

ABSTRACT

We consider action research as a form of deliberative policy analysis. This analysis explores a “reconstruction clinic” in which stakeholders and public officials engaged memories, hopes and obligations as they sought to resolve controversies over details of policy implementation. We ask how institutional design shaped participants’ reflective and deliberative progress. Reflection in action can prompt not only changes in cognitive frames, but new behavioural capacities for action. Deliberative practices can shape new relationships between parties through the work of apology, recognition, appreciation, and emergent collaboration.     

Cultivating students’ reflective capacity through group-based mindfulness instruction

ABSTRACT

Cultivating critically reflective practitioners is a vital professional competency for social work students. However, few reflective models support undergraduate students to foster nonconceptual skills important to developing reflective capacity. This article presents a group-taught mindfulness teaching intervention applied in a professional practice course to facilitate reflective capacity of social work students preparing for their first placement. Trial data derived from pre–post course administration of the Five Facet Mindfulness Questionnaire show significant gains in awareness were produced on two of the questionnaires’ five mindfulness facets of describe and nonjudgment. A developmental model detailing these shifts and its implications for group-based learning is outlined.