What’s so special about Euclidean distance?

In this paper, we provide an application-oriented characterization of a class of distance functions monotonically related to the Euclidean distance in terms of some general properties of distance functions between real-valued vectors. Our analysis hinges upon two fundamental properties of distance functions that we call “value-sensitivity” and “order-sensitivity”. We show how these two general properties, combined with natural monotonicity considerations, lead to characterization results that single out several versions of Euclidean distance from the wide class of separable distance functions. We then discuss and motivate our results in two different and apparently unrelated application areas—mobility measurement and spatial voting theory—and propose our characterization as a test for deciding whether Euclidean distance (or some suitable variant) should be used in your favourite application context. We would like to thank an editor and especially two anonymous referees for very useful comments which helped us to improve the paper substantially.     

Ranking and Prioritization of Emergency Departments Based on Multi-indicator Systems

In this work we discuss how Emergency Departments (EDs) can be ranked on the basis of multiple indicators. This problem is of absolute relevance due to the increasing importance of EDs in regional healthcare systems and it is also complex as the number of indicators that have been proposed in the literature to measure ED performance is very high. Current literature faces this problem using synthetic (or numerically aggregated) indicators of a set of performance measures but, although simple, this solution has a number of drawbacks that make this choice inefficient: a compensation effect among the indicators; a high degree of subjectivism in the indicators weighting; opacity in the decision making; all the EDs are considered to be comparable. Indeed, the situations in which EDs are comparable (i.e. when all the performance of one ED are not lower than the performance indicators of the other) are a minority and incomparability is by itself a source of information that should be used to identify situations for which different policy actions should be designed. In this work we propose to use non compensatory composite indicators and partial ordering theory to rank and compare EDs giving value to the reasons of such an incomparability. These methods are applied on a case study of 19 EDs in an administrative region in Italy.     

Multidimensional Pigou–Dalton transfers and social evaluation functions

We axiomatize, in the multidimensional case, a social evaluation function that can accommodate a natural Pigou–Dalton principle and correlation increasing majorization. This is performed by building upon a simple class of inframodular functions proposed by Müller and Scarsini under risk.     

Cash‐for‐care payments in Europe: Changes in resource allocation

Resource allocation has been a main policy issue in cash‐for‐care schemes (CfCs) for older people in Europe since their inception. It regards how publicly funded care benefits and services are distributed among older people. The raising pressures of an ageing population and the tensions on the financial sustainability of welfare regimes in place have further exacerbated the relevance of this topic over the recent years. Nevertheless, comparative research so far has overlooked changes in resource allocation in CfCs over time. This article contributes to fill this gap, exploring changes in resource allocation of CfCs for older people in a sample of European countries—Austria, England, France, Germany, Italy, and The Netherlands—since the early '90s (or since the introduction of the scheme). It examines three analytical dimensions: (a) The mix of public services and benefits provided to older people (CfCs, community services in kind, residential care); (b) the level of CfCs coverage; and (c) its generosity. A combined view of these dimensions leads to the discussion of two dilemmas: How to allocate the resources devoted to CfCs in the light of the trade‐off between its coverage and intensity? And, within the whole long‐term care system, how to allocate resources between CfCs and services in kind?     

Work–family conflict and job insecurity: are workers from different generations experiencing true differences?

This paper explores the question whether workers of different generations significantly diverge in their perceptions of work–family conflict and job insecurity and implications of such differences on affective commitment and job satisfaction. Given the explorative nature of this study, we use a multi-method approach which relies on a focus group with Italian graduated students and on a field study with workers from an Italian food processing company respectively grouped in three generational cohorts: Baby Boomers, gen Xers, and Millennials. Overall, our findings demonstrate that workers belonging to different generational cohorts display divergent perceptions of work–family conflict and job insecurity. However, the effects of such perceptions on work attitudes are not directly correlated with the experienced levels of job insecurity and work–family conflict. That is, although Millennials tend to perceive a higher level of job insecurity than Baby Boomers and gen Xers, job insecurity is more likely to produce negative consequences on work attitudes among Baby Boomers and gen Xers rather than among Millennials. Notably, our findings indicate that there are no significant differences with regard to the effects of work–family conflict on affective commitment and job satisfaction among the three generational cohorts considered.     

Identifying treatment effects using trimmed means when data are missing not at random

Patients often discontinue from a clinical trial because their health condition is not improving or they cannot tolerate the assigned treatment. Consequently, the observed clinical outcomes in the trial are likely better on average than if every patient had completed the trial. If these differences between trial completers and non-completers cannot be explained by the observed data, then the study outcomes are missing not at random (MNAR). One way to overcome this problem—the trimmed means approach for missing data due to study discontinuation—sets missing values as the worst observed outcome and then trims away a fraction of the distribution from each treatment arm before calculating differences in treatment efficacy (Permutt T, Li F. Trimmed means for symptom trials with dropouts. Pharm Stat. 2017;16(1):20–28). In this paper, we derive sufficient and necessary conditions for when this approach can identify the average population treatment effect. Simulation studies show the trimmed means approach's ability to effectively estimate treatment efficacy when data are MNAR and missingness due to study discontinuation is strongly associated with an unfavorable outcome, but trimmed means fail when data are missing at random. If the reasons for study discontinuation in a clinical trial are known, analysts can improve estimates with a combination of multiple imputation and the trimmed means approach when the assumptions of each hold. We compare the methodology to existing approaches using data from a clinical trial for chronic pain. An R package trim implements the method. When the assumptions are justifiable, using trimmed means can help identify treatment effects notwithstanding MNAR data.     

Ergonomic sustainability based on the ergonomic maturity level measurement

This paper aims at the application of an ergonomic maturity model (EMM), in order to assess the ergonomic sustainability outreach of ergonomic actions. This proposition was motivated by the widespread sensation that the development of the discipline, its educational devices and related practices depends on the attitude of ergonomics practitioners rather than environmental macroergonomic conditions. Maturity modeling in this paper is undertaken as a tool for ergonomic practitioners. Thus, its foundations were uprooted from diverse fields: Clinic Psychology, Quality Management and Project Management. The paper brings about a detailled explanation of this ergonomic maturity tool. The empirical part is fulfilled by the examination - using the EMM - of four emblematic cases excerpted from our research lab ergonomic portfolio.     

Uncertainty,Flexibility Gap and Labour Demand in the Italian Economy

In this paper we analyse the effects of changes in the degree of uncertainty of the economic system and in the “flexibility gap”, deriving from the combined evolution of the degrees of uncertainty and flexibility of the economic system (in particular, labour market flexibility), on regular and irregular labour demand. On the basis of a simple qualitative model, we give a partial interpretation of some stylized facts of the Italian economy during the last decades. We argue that the low uncertainty and flexibility gap in the 1950s and 1960s, their remarkable increases in the 1970s, their inadequate reduction in the 1980s and the new increase of uncertainty and flexibility gap in the first half of the 1990s, have had a considerable influence on the quantity and quality of the “investment in employment” of Italian economy. The higher degree of uncertainty and the inadequate degree of flexibility of the Italian economic system are likely to have contributed towards the lower regular employment rate, compared to the main industrialized countries, and to high irregular employment. An adequate economic policy for reducing the uncertainty of the economic system together with a structural economic policy for increasing the flexibility of the economic system (in particular, an active labour policy for increasing the flexibility of the labour market), would be likely to produce positive effects on the quantity and quality of labour demand, contributing towards reducing unemployment.     

The scorpions of the urban habitat of Rome (Italy)

A review of the scorpions (three species of the genus Euscorpius, family Chactidae) found in the urban habitat of Rome, Central Italy, together with an analysis of the factors which affect their distribution and abundance in the town, is pointed out. It appears that Euscorpius carpathicus, a species commonly found on limestone terrains in Latium, is frequent, though not particularly abundant, in the urban area of the city especially along the course of the Tiber River. It appears that Euscorpius flavicaudis, a species commonly found on volcanic terrains in Latium and the most common terrains in and around the area of Rome, is the most common species in both the urban and suburban areas of the city. It appears that Euscorpius italicus, a species common in north and northeastern Latium, is represented, in the sample of the scorpions of the city, by a single, possibly aberrant, specimen.