Some Reflections on Combining Meta-Analysis and Structural Equation Modeling

Cheung, Mike W.‐L.

doi:10.31234/osf.io/j65th

Cited by 19 publications

(37 citation statements)

References 48 publications

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“…Therefore, the dataset contained some repeated data entries from the same study, and corresponding multiple eCO 2 or drought treatments with the same aCO 2 or well-watered treatments. The non-independent observations were tackled using the 'shifting the unit of analysis' approach (Cheung, 2015;Liang et al, 2020) in Section 2.3. In our database, species were categorized by photosynthetic pathways (C 3 plant and C 4 plant, C 3 herb and C 4 herb, C 3 grass and C 4 grass, and C 3 crop and C 4 crop) and plant growth forms (woody plant and C 3 herb, tree and shrub, and C 3 grass and C 3 forb).…”

Section: Literature Searching and Data Compilingmentioning

confidence: 99%

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Elevated CO₂ alleviates adverse effects of drought on plant water relations and photosynthesis: A global meta‐analysis

2022

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1. The elevated CO 2 concentration (eCO 2 ) is expected to improve plant water relations and carbon (C) uptakes, with a potential to mitigate drought stress.However, the interactive effects of eCO 2 and drought on plant physiology and growth are not clear.2. We performed a meta-analysis on the interactive effects of eCO 2 and drought on plant water relations, photosynthesis, biomass production and allocation.3. We found that eCO 2 did not lead to the conservation of soil water, but improved leaf water status under drought conditions as evidenced by a higher leaf relative water content (LRWC) and a less negative midday leaf water potential, resulting from reduced stomatal conductance (g s ) and increased root to shoot ratio.Elevated CO 2 retarded the response of g s to drought, which may be mediated by the decrease in leaf abscisic acid concentration under eCO 2 and drought.Drought imposed stomatal limitations on photosynthesis (A), which was alleviated by eCO 2 via increasing intercellular CO 2 concentration (C i ). This led to a stronger A response to eCO 2 under drought, supporting the 'low C i effect'.However, no interaction of eCO 2 and drought was detected on plant biomass production. Intrinsic water use efficiency (iWUE) increased proportionally with eCO 2 , while plant-scale WUE was less responsive to eCO 2 . C 3 plants had advantages over C 4 plants in terms of A and biomass production under eCO 2 and wellwatered conditions rather than under eCO 2 and drought conditions. Drought caused a greater reduction in biomass for woody plants than for herbs. Plants growing in pots showed greater decreases in the physiology and biomass under drought than those growing in field. 4. Synthesis. These findings suggest that eCO 2 can alleviate the adverse impacts of drought on plant water relations and C sequestration, and are of significance in the prediction of plant growth and ecosystem productivity under global changes. K E Y W O R D S biomass, drought, elevated CO 2 , gas exchange, global change ecology, water potential, water use efficiency | 2837

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Section: Literature Searching and Data Compilingmentioning

confidence: 99%

“…The 'shifting the unit of analysis' approach (Cheung, 2015) was used to tackle the non-independent observations described above. The initial weight (w) of each observation was calculated as:…”

Section: Independence and Weightsmentioning

confidence: 99%

Elevated CO₂ alleviates adverse effects of drought on plant water relations and photosynthesis: A global meta‐analysis

2022

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“…Hence, we used multivariate meta-analysis models to take into account the dependencies that result from including multiple outcome variables measured in the same sample (e.g., Cheung, 2019;Riley, 2009). We applied the Fisher's z-transformation to the correlation coefficients to obtain an effect size measure that is normally distributed, which is a requirement for the multivariate meta-analysis model (e.g., Cheung, 2015). After the analysis, we back-transformed the Fisher's z scores into correlation coefficients and reported the correlation coefficients in the Results section.…”

Section: Discussionmentioning

confidence: 99%

“…However, this was not feasible in our meta-analysis, because many of the relevant effect sizes were not reported in most included studies. Similarly, we could not use meta-analytic structural equation modeling (e.g., Cheung, 2015) because a large portion of the relevant data points were missing values. Estimating causal effects and fitting complex structural equation models is more feasible in a primary study or a mega-analysis (i.e., the pooling of raw data from multiple studies; e.g., Eisenhauer, 2021) than in a meta-analysis.…”

Section: Limitations and Future Directionsmentioning

confidence: 99%

A Meta-Analytic Review of the Associations of Personality, Intelligence, and Physical Size with Social Status

Grosz¹,

Aert²,

Back³

2023

Preprint

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Theories have proposed diverse reasons for why individual differences such as personality traits lead to social status attainment in face-to-face groups. We integrated these different theoretical standpoints into a model with four paths from individual differences to status: a dominance, a competence, a virtue, and a micropolitics path. To investigate these paths, we conducted a meta-analysis of over 100 years of research on bivariate associations of personality traits, cognitive abilities, and physical size with the attainment of status related outcomes in face-to-face groups (1,064 effects from 276 samples including 56,153 participants). The status related outcome variables were admiring respect, social influence, popularity, leadership emergence, and a mixture outcome variable. The meta-analytic correlations we found were largely in line with the micropolitics path, tentatively in line with the competence and virtue paths, and only partly in line with the dominance path. These findings suggest that status attainment depends on the competence and virtue of an individual but also on how individuals can enhance their apparent competence or virtue by behaving assertively, by being extraverted, or through self-monitoring. We also investigated how the relations between individual differences and status related outcomes were moderated by kind of status related outcome, nature of the group task, culture (collectivism/individualism), and length of acquaintance. The moderation analysis yielded mixed and inconclusive results. The review concludes with directions for research such as the need to separately assess and study the different status related outcomes.

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“…Also, three-level mixed-effects models were fitted to explore the relationship between the effect sizes and a group of potentially moderator variables. Pseudo-R 2 estimations (Cheung, 2015) were performed for each parameter and variance component through the equations,…”

Section: Data Extractionmentioning

confidence: 99%

Differences in Ex-Gaussian Parameters from Response Time Distributions Between Individuals with and Without Attention Deficit/Hyperactivity Disorder: A Meta-analysis

Bella-Fernández

Martín-Moratinos

et al. 2023

Neuropsychol Rev

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Attention Deficit Hyperactivity Disorder (ADHD) is one of the most prevalent neurodevelopmental disorders in childhood and adolescence. Differences in reaction times (RT) in cognitive tasks have been consistently observed between ADHD and typical participants. Instead of estimating means and standard deviations, fitting non-symmetrical distributions like the ex-Gaussian, characterized by three parameters (µ, σ, and τ), account for the whole RT distributions. A meta-analysis is performed with all the available literature using ex-Gaussian distributions for comparisons between individuals with ADHD and controls. Results show that τ and σ are generally greater for ADHD samples, while µ tends to be larger for typical groups but only for younger ages. Differences in τ are also moderated by ADHD subtypes. τ and σ show, respectively, quadratic and linear relationships with inter-stimulus intervals from Continuous Performance Test and Go/No Go tasks. Furthermore, tasks and cognitive domains influence the three parameters. Interpretations of ex-Gaussian parameters and clinical implications of these findings are also discussed. Fitting ex-Gaussian distributions to RT data is a useful way to explore differences between individuals with ADHD and healthy controls.

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Some Reflections on Combining Meta-Analysis and Structural Equation Modeling

Cited by 19 publications

References 48 publications

Elevated CO₂ alleviates adverse effects of drought on plant water relations and photosynthesis: A global meta‐analysis

Elevated CO₂ alleviates adverse effects of drought on plant water relations and photosynthesis: A global meta‐analysis

A Meta-Analytic Review of the Associations of Personality, Intelligence, and Physical Size with Social Status

Differences in Ex-Gaussian Parameters from Response Time Distributions Between Individuals with and Without Attention Deficit/Hyperactivity Disorder: A Meta-analysis

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Some Reflections on Combining Meta-Analysis and Structural Equation Modeling

Cited by 19 publications

References 48 publications

Elevated CO2 alleviates adverse effects of drought on plant water relations and photosynthesis: A global meta‐analysis

Elevated CO2 alleviates adverse effects of drought on plant water relations and photosynthesis: A global meta‐analysis

A Meta-Analytic Review of the Associations of Personality, Intelligence, and Physical Size with Social Status

Differences in Ex-Gaussian Parameters from Response Time Distributions Between Individuals with and Without Attention Deficit/Hyperactivity Disorder: A Meta-analysis

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Product

Resources

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Elevated CO₂ alleviates adverse effects of drought on plant water relations and photosynthesis: A global meta‐analysis

Elevated CO₂ alleviates adverse effects of drought on plant water relations and photosynthesis: A global meta‐analysis