scholarly journals The Idiographic Ising model

2019 ◽  
Author(s):  
Maarten Marsman

The Ising model is a graphical model that has played an essential role in the field of network psychometrics, where it has been used as a theoretical model to re-conceptualize psychometric concepts and as a statistical model for the analysis of psychological data. But in network psychometrics, the psychological data that are analyzed often come from cross-sectional applications, and the practice of using graphical models such as the Ising model to analyze these data has been heavily critiqued in the past few years. The primary voiced concern centers around the inability of the Ising model to express heterogeneity in the population, and the necessity to then assume that the population is homogeneous w.r.t. the network's structure in practice. But associations at the group-level may be entirely different from associations at the individual level, and it is unclear what the estimated relations from cross-sectional data imply for associations at the individual level. In this paper, an idiographic interpretation of the Ising model is developed that does not require that persons are exchangeable replications of a single topological structure. Working with a clear, formal connection between network relations at the individual- and the group level, we have unique topological structures that characterize individuals and aggregate into an Ising model cross-sectionally.

2021 ◽  
pp. 1-6
Author(s):  
Meryem Grabski ◽  
Jon Waldron ◽  
Tom P. Freeman ◽  
Claire Mokrysz ◽  
Ruben J.J. van Beek ◽  
...  

<b><i>Background:</i></b> Monitoring emerging trends in the increasingly dynamic European drug market is vital; however, information on change at the individual level is scarce. In the current study, we investigated changes in drug use over 12 months in European nightlife attendees. <b><i>Method:</i></b> In this longitudinal online survey, changes in substances used, use frequency in continued users, and relative initiation of use at follow-up were assessed for 20 different substances. To take part, participants had to be aged 18–34 years; be from Belgium, Italy, the Netherlands, Sweden, or the UK; and have attended at least 6 electronic music events in the past 12 months at baseline. Of 8,045 volunteers at baseline, 2,897 completed the survey at both time points (36% follow-up rate), in 2017 and 2018. <b><i>Results:</i></b> The number of people using ketamine increased by 21% (<i>p</i> &#x3c; 0.001), and logarithmized frequency of use in those continuing use increased by 15% (<i>p</i> &#x3c; 0.001; 95% CI: 0.07–0.23). 4-Fluoroamphetamine use decreased by 27% (<i>p</i> &#x3c; 0.001), and logarithmized frequency of use in continuing users decreased by 15% (<i>p</i> &#x3c; 0.001, 95% CI: −0.48 to −0.23). The drugs with the greatest proportion of relative initiation at follow-up were synthetic cannabinoids (73%, <i>N</i> = 30), mephedrone (44%, <i>N</i> = 18), alkyl nitrites (42%, <i>N</i> = 147), synthetic dissociatives (41%, <i>N</i> = 15), and prescription opioids (40%, <i>N</i> = 48). <b><i>Conclusions:</i></b> In this European nightlife sample, ketamine was found to have the biggest increase in the past 12 months, which occurred alongside an increase in frequency of use in continuing users. The patterns of uptake and discontinuation of alkyl nitrates, novel psychoactive substances, and prescription opioids provide new information that has not been captured by existing cross-sectional surveys. These findings demonstrate the importance of longitudinal assessments of drug use and highlight the dynamic nature of the European drug landscape.


2009 ◽  
Vol 22 (5) ◽  
pp. 621-630 ◽  
Author(s):  
Selma Coelho Liberato ◽  
Josefina Bressan ◽  
Andrew Peter Hills

OBJECTIVE: The objective was to assess the quantitative agreement between a 4-day food record and a 24-hour dietary recall in young men. METHODS: Thirty-four healthy men aged 18-25 years had their food intake estimated by 4-day food record within one week following 24-hour dietary recall in a cross-sectional study. Resting metabolic rate was assessed by indirect calorimetry and Energy Expenditure was estimated by physical activity records completed simultaneously with food intake records. The validity of food records was determined by direct comparison of Energy Intake and Energy Expenditure (95% confidence interval for Energy Intake/Energy Expenditure). RESULTS: There were good agreements between the measurements of energy and macronutrient intakes by 24-hour dietary recall and 4-day food record at the group level, but not at the individual level. Compared to energy expenditure, about 20% and 9% of participants underreported their Energy Intake by 4-day food record and 24-hour dietary recall, respectively. Over 30% of underreporters of Energy Intake estimated by 24-hour dietary recall underreported Energy Intake estimated by 4-day food record. CONCLUSION: Both diet methods, 24-hour dietary recall and 4-day food record, may be used to collect data at the group level, but not at the individual level. Both methods, however, appear to underestimate Energy Intake. Underreporting may be subject-specific and appears that is more difficult to retrieve valid dietary data from some people than others.


2020 ◽  
Author(s):  
Keith Payne ◽  
Heidi A. Vuletich ◽  
Kristjen B. Lundberg

The Bias of Crowds model (Payne, Vuletich, &amp; Lundberg, 2017) argues that implicit bias varies across individuals and across contexts. It is unreliable and weakly associated with behavior at the individual level. But when aggregated to measure context-level effects, the scores become stable and predictive of group-level outcomes. We concluded that the statistical benefits of aggregation are so powerful that researchers should reconceptualize implicit bias as a feature of contexts, and ask new questions about how implicit biases relate to systemic racism. Connor and Evers (2020) critiqued the model, but their critique simply restates the core claims of the model. They agreed that implicit bias varies across individuals and across contexts; that it is unreliable and weakly associated with behavior at the individual level; and that aggregating scores to measure context-level effects makes them more stable and predictive of group-level outcomes. Connor and Evers concluded that implicit bias should be considered to really be noisily measured individual construct because the effects of aggregation are merely statistical. We respond to their specific arguments and then discuss what it means to really be a feature of persons versus situations, and multilevel measurement and theory in psychological science more broadly.


2021 ◽  
pp. 073563312110308
Author(s):  
Fan Ouyang ◽  
Si Chen ◽  
Yuqin Yang ◽  
Yunqing Chen

Group-level metacognitive scaffolding is critical for productive knowledge building. However, previous research mainly focuses on the individual-level metacognitive scaffoldings in helping learners improve knowledge building, and little effort has been made to develop group-level metacognitive scaffolding (GMS) for knowledge building. This research designed three group-level metacognitive scaffoldings of general, task-oriented, and idea-oriented scaffoldings to facilitate in-service teachers’ knowledge building in small groups. A mixed method is used to examine the effects of the GMSs on groups’ knowledge building processes, performances, and perceptions. Results indicate a complication of the effects of GMSs on knowledge building. The idea-oriented scaffolding has potential to facilitate question-asking and perspective-proposing inquiry through peer interactions; the general scaffolding does not necessarily lessen teachers’ idea-centered explanation and elaboration on the individual level; the task-oriented scaffolding has the worst effect. Pedagogical and research implications are discussed to foster knowledge building with the support of GMSs.


Foods ◽  
2021 ◽  
Vol 10 (3) ◽  
pp. 681
Author(s):  
Nora A. Althumiri ◽  
Mada H. Basyouni ◽  
Ali F. Duhaim ◽  
Norah AlMousa ◽  
Mohammed F. AlJuwaysim ◽  
...  

Background: Food waste and food insecurity may co-exist in various balances in developing and developed countries. This study aimed to explore the levels of food waste and food insecurity, the factors associated with them, and their relationships at the household and individual levels in Saudi Arabia. Methods: This study was a nationwide cross-sectional survey conducted via computer-assisted phone interviews in January 2021. Quota sampling was utilized to generate balanced distributions of participants by gender across all the administrative regions of Saudi Arabia. Data collection included household demographics, food waste and disposal, the Food Insecurity Experience Scale (FIES), and the Household Food Insecurity Access Scale (HFIAS). Results: Out of the 2807 potential participants contacted, 2454 (87.4%) completed the interview. The mean age was 31.4 (SD = 11.7; range = 18–99) and 50.1% were female. The weighted prevalence of uncooked food waste in the last four weeks was 63.6% and the cooked food waste was 74.4%. However, the food insecurity weighted prevalence at the individual level (FIES) was 6.8%. In terms of food insecurity at the household level (HFIAS), 13.3% were in the “severely food insecure” category. Moreover, this study found that “moderately food insecure” households were associated with an increased likelihood to waste uncooked food (relative risk (RR) = 1.25), and the “mildly food insecure” (RR = 1.21) and “moderately food insecure” (RR = 1.17) households were associated with an increased likelihood to waste cooked food. However, “food secure” households were associated with a decreased likelihood to waste cooked food (RR = 0.56). Finally, this study identified four household factors associated with food waste and three household factors that were associated with “severe food insecurity.” Conclusions: This first national coverage study to explore food waste and food insecurity at the individual level and household level, identified household factors associated with food waste and food insecurity and identified new associations between food waste and food insecurity in Saudi Arabia. The associations found between food waste and food insecurity are potential areas of intervention to reduce both food waste and food insecurity at the same time, toward achieving the Sustainable Development Goal (SDG) targets related to food waste and food security.


Author(s):  
Katharina Diehl ◽  
Alessia Brassat ◽  
Jennifer Hilger-Kolb

Abstract Background To assess physical activity (PA), a comparative measurement – evaluating one’s own PA compared to others – may be an appropriate method. In previous studies, the use of comparative measurements led to an effect known as unrealistic comparative optimism (UCO) – people being unrealistically optimistic about their behavior. Our aim was to use this comparative measurement in university students to quantify the prevalence of UCO at the group level and to draw conclusions on its validity. Methods We used data from the Nutrition and Physical Activity in Adolescence Study (NuPhA), a cross-sectional online survey that included only self-reports (n = 689). To assess PA among students, they were asked to rate their PA level compared to that of their same-aged fellow students. In addition, we used the Godin-Shephard leisure-time PA questionnaire and other questions on PA for comparisons. We used bivariate and cluster-based analyses to identify potential UCO. Results We found that UCO at the group level led to an uneven distribution, with a higher proportion of students who rated themselves as being more physically active than average. However, the individual assessment of PA with a single and simple comparative question seemed to be valid. Discussion A global single comparative question seems useful for studies where PA is measured as a covariate in university students.


Author(s):  
Heather Getha-Taylor ◽  
Alexa Haddock-Bigwarfe

Purpose – The purpose of this paper is to examine public service motivation (PSM) and the connection with collaborative attitudes among a sample of homeland security actors representing the public, private, and nonprofit sectors. Design/methodology/approach – This study examines relationships between measures of PSM and collaboration using original survey data and hierarchical multiple regression. Findings – Findings reveal strong positive relationships between PSM measures and attitudes toward collaboration at the individual and organizational level. Research limitations/implications – Survey results are cross-sectional and are from respondents participating in a single state's homeland security summit. Practical implications – It is expected that results can be used to enhance collaboration at the individual and organizational levels. At the organizational level, results can be used for matching individuals with collaborative opportunities. At the individual level, results can be used for enhanced self-reflection and effectiveness purposes. Originality/value – This study provides insights on the relationship between PSM measures and collaborative attitudes. The research contributes to the body of scholarly work connecting PSM and correlates of interest.


2018 ◽  
Author(s):  
Mariano Calvo Martín ◽  
Stamatios C. Nicolis ◽  
Isaac Planas-Sitjà ◽  
Jean-Christophe de Biseau ◽  
Jean-Louis Deneubourg

AbstractCockroaches, like most social arthropods, are led to choose collectively among different alternative resting places. These decisions are modulated by different factors, such as environmental conditions (temperature, relative humidity) and sociality (groups size, nature of communications). The aim of this study is to establish the interplay between environmental conditions and the modulation of the interactions between individuals within a group leading to an inversion of preferences. We show that the preferences of isolated cockroaches and groups of 16 individuals, on the selection of the relative humidity of a shelter are inversed and shed light on the mechanisms involved. We suggest that the relative humidity has a multi-level influence on cockroaches, manifested as an attractant effect at the individual level and as a negative effect at the group level, modulating the interactions.


2022 ◽  
Vol 7 ◽  
pp. 14
Author(s):  
Paul Schneider ◽  
Ben van Hout ◽  
Marike Heisen ◽  
John Brazier ◽  
Nancy Devlin

Introduction Standard valuation methods, such as TTO and DCE are inefficient. They require data from hundreds if not thousands of participants to generate value sets. Here, we present the Online elicitation of Personal Utility Functions (OPUF) tool; a new type of online survey for valuing EQ-5D-5L health states using more efficient, compositional elicitation methods, which even allow estimating value sets on the individual level. The aims of this study are to report on the development of the tool, and to test the feasibility of using it to obtain individual-level value sets for the EQ-5D-5L. Methods We applied an iterative design approach to adapt the PUF method, previously developed by Devlin et al., for use as a standalone online tool. Five rounds of qualitative interviews, and one quantitative pre-pilot were conducted to get feedback on the different tasks. After each round, the tool was refined and re-evaluated. The final version was piloted in a sample of 50 participants from the UK. A demo of the EQ-5D-5L OPUF survey is available at: https://eq5d5l.me Results On average, it took participants about seven minutes to complete the OPUF Tool. Based on the responses, we were able to construct a personal EQ-5D-5L value set for each of the 50 participants. These value sets predicted a participants' choices in a discrete choice experiment with an accuracy of 80%. Overall, the results revealed that health state preferences vary considerably on the individual-level. Nevertheless, we were able to estimate a group-level value set for all 50 participants with reasonable precision. Discussion We successfully piloted the OPUF Tool and showed that it can be used to derive a group-level as well as personal value sets for the EQ-5D-5L. Although the development of the online tool is still in an early stage, there are multiple potential avenues for further research.


Author(s):  
Fernando Coelho Dias ◽  
Mateus Menezes Ribeiro ◽  
Camilla Oleiro Da Costa ◽  
Zayanna Christine Lopes Lindôso

Introdução: Atualmente, a obesidade é considerada um grave problema de saúde pública, pois além de ser uma doença, é um fator de risco para progressão e desenvolvimento de outras doenças crônicas não transmissíveis. Objetivo: Compreender a percepção de indivíduos com obesidade quanto à participação em papeis ocupacionais, grau de importância atribuído a cada papel e padrão de desempenho de papeis ocupacionais ao longo da vida. Método: Configura-se como um estudo transversal do tipo exploratório de caráter descritivo, com análise quantitativa dos dados. Como instrumento, utilizou-se a Lista de Identificação de Papéis Ocupacionais. Resultados: A amostra foi composta por 65 indivíduos com obesidade, 87,7% (n=57) era do sexo feminino e 12,3% (n=8) do sexo masculino, tendo como média de idade 42 anos e 9 meses. Constatou-se que o papel mais comum no passado foi o de estudante e com relação ao presente e futuro, os papeis mais citados foram os de serviço doméstico e membro da família. Quanto ao grau de importância, identificou-se que os indivíduos valorizam os papeis ocupacionais, atribuindo maior valorização aos papeis de membro da família e trabalho, e menor proporção de valor ao papel de participação em organizações. Conclusão: A condição de obesidade pode interferir no modo como o indivíduo se envolve e desempenha suas ocupações, evidenciando a terapia ocupacional como uma estratégia importante no enfrentamento da obesidade. AbstractIntroduction: Currently, obesity is considered a serious public health problem, since it is also a disease, it is a risk factor for progression and development of other chronic non-communicable diseases. Objective: To understand the perception of individuals with obesity regarding the participation in occupational roles throughout life, about the degree of importance attributed to each role, and in a complementary way to identify the performance pattern of occupational roles in Long life. Method: It is configured as a cross-sectional exploratory study of descriptive character, with quantitative analysis of the data, as an instrument used the identification list of occupational roles. Results: The sample consisted of 65 obese individuals. Of these, 87.7% (n = 57) were females and 12.3% (n = 8) were males, with a mean age of 42 years 9 months. It was found that the most common role in the past was that of student and in relation to the present and future the most cited roles were those of domestic service and family member. As to the degree of importance, it was identified that the individuals value the occupational roles, attributing greater value to the roles of family members and work, and less appreciation of the role of participation in organizations. Conclusion: The condition of obesity can interfere in the way the individual engages and performs his occupations, thus placing the occupational therapy professional as an important member in coping with obesity.Key words: Obesity, Activities of Daily Living, Occupations, Occupational Therapy.ResumenIntroducción: Actualmente, la obesidad se considera un grave problema de salud pública, ya que es también una enfermedad, es un factor de riesgo para la progresión y el desarrollo de otras enfermedades crónicas no transmisibles. Objetivo: comprender la percepción de los individuos con obesidad con respecto a la participación en los roles ocupacionales a lo largo de la vida, sobre el grado de importancia atribuido a cada función, y de manera complementaria para identificar el patrón de desempeño de los roles ocupacionales en Larga vida. Método: se configura como un estudio exploratorio transversal de carácter descriptivo, con análisis cuantitativo de los datos, como instrumento utilizó la lista de identificación de roles ocupacionales. Resultados: la muestra consistió en 65 individuos obesos. De ellos, 87,7% (n = 57) fueron hembras y 12,3% (n = 8) fueron varones, con una edad media de 42 años 9 meses. Se descubrió que el papel más común en el pasado era el de los estudiantes y en relación con el presente y el futuro, los papeles más citados eran los del servicio doméstico y el miembro de la familia. En cuanto al grado de importancia se identificó que los individuos valoran los papeles ocupacionales, atribuyendo mayor valoración a los papeles de miembro de la familia y trabajo, y menor valorización al papel de participación en organizaciones. Conclusión: la condición de la obesidad puede interferir en la forma en que el individuo se involucra y realiza sus ocupaciones, colocando así al profesional de la terapia ocupacional como un miembro importante para hacer frente a la obesidad.Palabras clave: Obesidad, Actividades Cotidianas, Ocupaciones, Terapia Ocupacional.  


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