Investigating speed-safety association: Considering the unobserved heterogeneity and human factors mediation effects [PDF]
PLoS ONE, 2023 The relationship between mean speed and crash likelihood is unclear in the literature. The contradictory findings can be attributed to the masking effects of the confounding variables in this association. Moreover, the unobserved heterogeneity has almost
Habibollah Nassiri +1 more
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Comparison of statistical methods for the analysis of recurrent adverse events in the presence of non-proportional hazards and unobserved heterogeneity: a simulation study [PDF]
BMC Medical Research Methodology, 2022 Background In preventive drug trials such as intermittent preventive treatment for malaria prevention during pregnancy (IPTp), where there is repeated treatment administration, recurrence of adverse events (AEs) is expected.
Noel Patson +6 more
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Modeling unobserved heterogeneity in multistate event history data using frailty and weighted survival approaches [PDF]
Scientific ReportsConventional survival analysis models typically assume that the hazard function depends solely on the baseline hazard and covariate values, overlooking unobserved factors that influence survival outcomes.
Abhipsa Tripathy +2 more
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A re-analysis of the Cochrane Library data: the dangers of unobserved heterogeneity in meta-analyses. [PDF]
PLoS ONE, 2013 BackgroundHeterogeneity has a key role in meta-analysis methods and can greatly affect conclusions. However, true levels of heterogeneity are unknown and often researchers assume homogeneity.
Evangelos Kontopantelis +2 more
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Unobserved population heterogeneity and dynamics of health disparities [PDF]
Demographic Research, 2020 Background: A growing body of literature has reported widening educational health disparities across birth cohorts or time periods in the United States, but research has paid little attention to the implication of mortality selection on the cohort trend ...
Hui Zheng
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Understanding the heterogeneity in healthcare expenditure in India [PDF]
BMC Medical Research MethodologyHealth expenditure is indicative of the financial burden of health care and serves as a yardstick of health system performance. However, health expenditure may be shaped by multiple factors such as prevalence of morbidity, income inequality and above all,
Srikanth Reddy Umenthala +2 more
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Modeling Spatial Interaction in Stochastic Frontier Analysis
Frontiers in Sustainable Food Systems, 2021 We compare farm level efficiency rankings derived from non-spatial and a variety of spatial model specifications that account for unobserved heterogeneity in both the production and the efficiency sides of the stochastic frontier model in an empirical ...
Francisco J. Areal, Valerien O. Pede
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Unobserved Heterogeneity between Individuals in Group-Focused Enmity
International Journal of Conflict and Violence, 2022 Group-focused enmity (GFE) and related research have mostly focused on variable-centred analyses such as structural equation modelling and factor analysis, implicitly assuming that the results apply uniformly to all participants in the sample.
Maria-Therese Friehs +4 more
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Heterogeneity in coronary heart disease risk
Scientific Reports, 2022 There is large inter-individual heterogeneity in risk of coronary heart disease (CHD). Risk factors traditionally used in primary risk assessment only partially explain this heterogeneity.
Cristoforo Simonetto +3 more
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Estimating marginal treatment effects under unobserved group heterogeneity
Journal of Causal Inference, 2022 This article studies the treatment effect models in which individuals are classified into unobserved groups based on heterogeneous treatment rules. By using a finite mixture approach, we propose a marginal treatment effect (MTE) framework in which the ...
Hoshino Tadao, Yanagi Takahide
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