Measure of Asymmetry for Square Contingency Tables Having Ordered Categories

For the analysis of square contingency tables with nominal categories, Tomizawa and coworkers have considered measures that represent the degree of departure from symmetry. This paper proposes a measure that represents the degree of asymmetry for square contingency tables with ordered categories (instead of those with nominal categories). The measure proposed is expressed using the Cressie–Read power-divergence or Patil–Taillie diversity index, defined for the cumulative probabilities that an observation falls in row (column) category i or below and column (row) category j (> i ) or above. The measure depends on the order of listing the categories. It should be useful for comparing the degree of asymmetry in several tables with ordered categories. The relationship between the measure and the normal distribution is shown.     

Maternal employment and food produced at home: evidence from Japanese data

This paper examines whether mothers’ labor supply discourages home production, focusing on food preparation at home in Japanese families. Although empirical studies on home production are usually conducted using time use data, we use data collected by scanners, which cover daily goods purchased by over 10,000 households over 3 years. Based on the composition of daily food expenditures for foods consumed, we measure how many products are made using time-consuming processes at home, and examine if time-consuming home production is discouraged by mothers’ employment away from home. Controlling for unobserved heterogeneity among households using the panel structure of our scanner data, we first show that mothers’ out-of-home employment has a negative effect on home cooking. This effect is shared across economic classes, particularly when mothers work part-time, as compared with non-working mothers. Second, we show that this negative effect is more apparent in the low economic class. Households in this class show a particular decrease in time-consuming home cooking, especially when the mothers work part-time. Third, the smaller negative effect among the higher class can be explained by stronger health-consciousness and aversion to less-healthy products in this class.     

The minimum vulnerability problem on specific graph classes

Suppose that each edge e of an undirected graph G is associated with three nonnegative integers \(\mathsf{cost}(e)\), \(\mathsf{vul}(e)\) and \(\mathsf{cap}(e)\), called the cost, vulnerability and capacity of e, respectively. Then, we consider the problem of finding \(k\) paths in G between two prescribed vertices with the minimum total cost; each edge e can be shared without any cost by at most \(\mathsf{vul}(e)\) paths, and can be shared by more than \(\mathsf{vul}(e)\) paths if we pay \(\mathsf{cost}(e)\), but cannot be shared by more than \(\mathsf{cap}(e)\) paths even if we pay the cost for e. This problem generalizes the disjoint path problem, the minimum shared edges problem and the minimum edge cost flow problem for undirected graphs, and it is known to be NP-hard. In this paper, we study the problem from the viewpoint of specific graph classes, and give three results. We first show that the problem is NP-hard even for bipartite outerplanar graphs, 2-trees, graphs with pathwidth two, complete bipartite graphs, and complete graphs. We then give a pseudo-polynomial-time algorithm for bounded treewidth graphs. Finally, we give a fixed-parameter algorithm for chordal graphs when parameterized by the number \(k\) of required paths.     

Looking represents choosing in toddlers: Exploring the equivalence between multimodal measures in forced-choice tasks

In the two-alternative forced-choice (2AFC) paradigm, manual responses such as pointing have been widely used as measures to estimate cognitive abilities. While pointing measurements can be easily collected, coded, analyzed, and interpreted, absent responses are often observed particularly when adopting these measures for toddler studies, which leads to an increase of missing data. Although looking responses such as preferential looking can be available as alternative measures in such cases, it is unknown how well looking measurements can be interpreted as equivalent to manual ones. This study aimed to answer this question by investigating how accurately pointing responses (i.e., left or right) could be predicted from concurrent preferential looking. Using pre-existing videos of toddlers aged 18–23 months engaged in an intermodal word comprehension task, we developed models predicting manual from looking responses. Results showed substantial prediction accuracy for both the Simple Majority Vote and Machine Learning-Based classifiers, which indicates that looking responses would be reasonable alternative measures of manual ones. However, the further exploratory analysis revealed that when applying the created models for data of toddlers who did not produce clear pointing responses, the estimation agreement of missing pointing between the models and the human coders slightly dropped. This indicates that looking responses without pointing were qualitatively different from those with pointing. Bridging two measurements in forced-choice tasks would help researchers avoid wasting collected data due to the absence of manual responses and interpret results from different modalities comprehensively.     

Gender Differences in the Effect of Job Characteristics on Work‐to‐Family Conflict in Japan: Application of the Job Demands‐Resources Model into Japanese Population1

This article uses the job demand‐resources (JD‐R) model to analyze the Japanese population and gender differences in work‐to‐family conflict in Japan. Using data from the International Social Survey Programme in 2015, the study addresses four main questions: (i) does the JD‐R model apply to the Japanese population? (ii) which gender is more likely to experience work‐to‐family conflict? (iii) does gender moderate the relationship between work‐related factors and work‐to‐family conflict? and (iv) do different factors predict work‐to‐family conflict between men and women? The findings show that the JD‐R model applies in part to the Japanese population, and women are more likely to experience a higher level of work‐to‐family conflict than men. There are also different factors predicting work‐to‐family conflict by gender, even though gender does not moderate the relationship between work‐related factors and work‐to‐family conflict. This article points out the peculiar Japanese social and cultural contexts that lead to gender differences in work‐to‐family conflict. It offers two solutions: (i) legal regulations to reduce working hours and the frequency of working on weekends to prevent work from intruding on family life; and (ii) changes to the work environment to make women workers more comfortable at work because of the male‐dominated workplace and Japanese culture on family gender roles in Japan.     

Enhancing vowel discrimination using constructed spelling

In a computerized task, an adult with intellectual disabilities learned to construct consonant-vowel-consonant words in the presence of corresponding spoken words. During the initial assessment, the participant demonstrated high accuracy on one word group (containing the vowel-consonant units it and un) but low accuracy on the other group (containing the units ag and ed). Errors occurred almost exclusively in the vowel position. Training the group with low accuracy increased accuracy on the trained word group but decreased the accuracy on the untrained, but initially accurate, group. High accuracy on both groups together occurred only after added training in which all five vowels (a, e, i, u, and o) were taught together in words that differed only in the vowel. These findings indicate the importance of carefully arranging examples and nonexamples to sharpen stimulus control. The findings also illustrate a promising step in the development of effective instructional programming for remediation of medial-vowel errors, which can be a source of difficulty in early reading instruction.     

Noncompliance with Human Subjects’ Protection Requirements as a Reason for Retracting Papers: Survey of Retraction Notices on Medical Papers Published from 1981 to 2011

Though protection of human research subjects is universally recognized as a critical requirement for the ethical conduct of research, few studies have examined retractions of medical articles through apparent noncompliance with that requirement. From our survey of 99 retracted papers published from 1981 to 2011, we found that the basis for those decisions was poorly explained in retraction notices and that most of the articles continued to be cited. In retraction notices, the current manner of explaining failure to protect human subjects is misleading and confusing.     

Time discounting: Declining impatience and interval effect

Most studies have not distinguished delays from intervals, so that whether the declining impatience really holds has been an open question. We conducted an experiment that explicitly distinguishes between them, and confirmed it at short delay such as less than an 8-week delay. This implies that people make dynamically inconsistent plans. We also found the interval effect that the time discount rate decreases with prolonged intervals. We show that the interval and the magnitude effects are caused because intertemporal choice is made partially based on the differential in reward amount, while Weber’s Law explains neither the delay nor the interval effects sufficiently.

A Kaupapa Māori,culturally progressive,narrative review of literature on sport,ethnicity and inclusion

ABSTRACT

This Kaupapa Māori narrative review identifies themes in literature concerning sport, ethnicity and inclusion, from an indigenous ‘culturally progressive’ perspective. Scholars suggest that sport influences national identity and in Aotearoa/New Zealand, rugby is a rich site for examining such connections. Inclusiveness within sport is an expressed desire, although the academic scrutiny on this is limited. This study identifies and examines themes within literature (2008–2017), using a ‘Ngā Poutama Whetū’ culturally progressive review process, contributing nuanced understandings from the content. Results suggest that racist othering, representations and practices of ethnic minority exclusion are a reality in sport, although, locally, at least, the ‘cultural climate’ in sport strives for greater ethnic inclusivity. Conclusions suggest that current research in this domain is largely theoretical, insofar as challenges to organisations, power and privilege. However, future research should explore participants’ lived experiences at the intersections of ethnicity and inclusion in sport.     

A Note on Implementation of Bargaining Solutions

Miyagawa (Games and Economics Behavior 41(2), 292–308 [2002]) provides a simple extensive game form that implements a large class of two-agent bargaining solutions in subgame-perfect equilibrium. This class includes all of the Nash, Kalai–Smorodinsky, and relative utilitarian solutions. This note extends Miyagawa’s result to multi-agent bargaining problems.