A5033261896- Mental Health Research Topics
- Advanced Statistical Methods and Models
- Cryospheric studies and observations
- Landslides and related hazards
- Advanced Statistical Modeling Techniques
- Musculoskeletal pain and rehabilitation
- Child and Adolescent Psychosocial and Emotional Development
- Sensory Analysis and Statistical Methods
- Complex Network Analysis Techniques
- Suicide and Self-Harm Studies
- Statistical Methods and Applications
- Psychometric Methodologies and Testing
- Statistical Methods and Inference
- Data Analysis with R
- Functional Brain Connectivity Studies
- Muscle activation and electromyography studies
- Statistical Methods and Bayesian Inference
- Advanced Clustering Algorithms Research
- Social and Intergroup Psychology
- Technology Adoption and User Behaviour
- Spectroscopy and Chemometric Analyses
- Advanced Multi-Objective Optimization Algorithms
- Tensor decomposition and applications
- Digital Mental Health Interventions
- Opinion Dynamics and Social Influence
Harvard University
2016-2025
Harvard University Press
2015-2024
Center for Pain and the Brain
2021-2022
Karl Landsteiner University of Health Sciences
2021
University of Michigan
2021
William James College
2021
University of Southern California
2021
Karl Landsteiner Society
2015-2020
Slovak Research and Development Agency
2018
Institute of Normal and Pathological Physiology of the Slovak Academy of Sciences
2018
In this paper we present the methodology of multidimensional scaling problems (MDS) solved by means majorization algorithm. The objective function to be minimized is known as stress and functions which majorize are elaborated. This strategy solve MDS called SMACOF it implemented in an <b>R</b> package same name presented article. We extend basic theory terms configuration constraints, three-way data, unfolding models, projection resulting configurations onto spheres other quadratic surfaces....
Item response theory models (IRT) are increasingly becoming established in social science research, particularly the analysis of performance or attitudinal data psychology, education, medicine, marketing and other fields where testing is relevant. We propose R package eRm (extended Rasch modeling) for computing several extensions. A main characteristic some IRT models, model being most prominent, concerns separation two kinds parameters, one that describes qualities subject under...
Background Obsessive–compulsive disorder (OCD) is often co-morbid with depression. Using the methods of network analysis, we computed two networks that disclose potentially causal relationships among symptoms these disorders in 408 adult patients primary OCD and depression symptoms. Method We examined relationship between constituting syndromes by computing a (regularized) partial correlation via graphical LASSO procedure, directed acyclic graph (DAG) Bayesian hill-climbing algorithm....
In this paper we give a general framework for isotone optimization. First discuss generalized version of the pool-adjacent-violators algorithm (PAVA) to minimize separable convex function with simple chain constraints. Besides functions extend existing PAVA implementations in terms observation weights, approaches tie handling, and responses from repeated measurement designs. Since optimization problems can be formulated as programming linear constraints develop primal active set method solve...
This paper presents the <b>R</b> package <b>anacor</b> for computation of simple and canonical correspondence analysis with missing values. The is specified in a rather general way by imposing covariates on rows and/or columns two-dimensional frequency table. allows scaling methods such as standard, Benzécri, centroid, Goodman scaling. In addition, along well-known two- three-dimensional joint plots including confidence ellipsoids, it offers alternative plotting possibilities terms...
Judging goodness of fit in multidimensional scaling requires a comprehensive set diagnostic tools instead relying on stress rules thumb. This article elaborates corresponding strategies and gives practical guidelines for researchers to obtain clear picture the solution. Special emphasis will be placed use permutation tests. The second part focuses goodness-of-fit assessment an important variant called unfolding, which can applied broad range psychological data settings. Two real-life sets...
This study examined two facets of emotion development: word comprehension (knowing the meaning words such as "anger" or "excitement") and concept abstraction (representing emotions in terms internal psychological states that generalize across situations). Using a novel vocabulary assessment, we captured how cross-sectional sample participants aged 4-25 (N = 196) defined 24 emotions. Smoothing spline regression models suggested followed an emergent shape: Knowledge increased childhood...
<h3>Importance</h3> The weeks following discharge from psychiatric hospitalization are the highest-risk period for suicide attempts. Real-time monitoring of suicidal thoughts via smartphone prompts may be more indicative short-term risk than a single, cross-sectional assessment. <h3>Objective</h3> To test whether modeling dynamic changes in real-time during can improve predictions postdischarge attempts vs using only baseline (ie, admission) data or mean level hospitalization. <h3>Design,...
Over the past decade extensive research has examined segregation of human brain into large-scale functional networks. The resulting network maps, i.e. parcellations, are now commonly used for a priori identification However, use these particularly in developmental and clinical samples, hinges on four fundamental assumptions: (1) various parcellations equally able to recover networks interest; (2) adult-derived well represent children's brains; (3) properties, such as within-network...
The smacof package offers a comprehensive implementation of multidimensional scaling (MDS) techniques in R. Since its first publication (De Leeuw and Mair 2009b) the functionality has been enhanced, several additional methods, features utilities were added. Major updates include complete re-implementation unfolding allowing for monotone dissimilarity transformations, including row-conditional, circular, external unfolding. Additionally, constrained MDS was extended terms optimal variables....
Adolescence is characterized by the maturation of cortical microstructure and connectivity supporting complex cognition behavior. Axonal myelination influences brain during development enhancing neural signaling speed inhibiting plasticity. However, maturational timing human adolescence remains poorly understood. Here, we take advantage recent advances in high-resolution T1w/T2w mapping methods, including principled correction B1+ transmit field effects, using data from Human Connectome...
The months after psychiatric hospital discharge are a time of high risk for suicide. Intensive postdischarge case management, although potentially effective in suicide prevention, is likely to be cost-effective only if targeted at high-risk patients. A previously developed machine learning (ML) model showed that suicides can predicted from electronic health records and geospatial data, but it unknown prediction could improved by adding additional information. To determine whether information...
Homogeneity analysis combines the idea of maximizing correlations between variables a multivariate data set with that optimal scaling. In this article we present methodological and practical issues <b>R</b> package <b>homals</b> which performs homogeneity various extensions. By setting rank constraints nonlinear principal component can be performed. The partitioned into sets such is extended to canonical correlation or predictive models emulate discriminant regression models. For each model...
PREFACE. PART I: WEB STRUCTURE MINING. 1 INFORMATION RETRIEVAL AND SEARCH. Web Challenges. Search Engines. Topic Directories. Semantic Web. Crawling the Basics. Crawlers. Indexing and Keyword Search. Document Representation. Implementation Considerations. Relevance Ranking. Advanced Text Using HTML Structure in Evaluating Quality. Similarity Cosine Similarity. Jaccard Resemblance. References. Exercises. 2 HYPERLINK-BASED RANKING. Introduction. Social Networks Analysis. PageRank. Authorities...
Recently there has been a renewed interest in formative measurement and its role properly specified models. Formative models are difficult to identify, hence estimate test. Existing solutions the identification problem shown not adequately represent constructs of interest. We propose new two-step approach operationalize formatively measured construct that allows closely matched common factor equivalent be included any structural equation model. provide an artificial example original...
An emerging trend in youth psychotherapy is measurement-based care (MBC): treatment guided by frequent measurement of client response, with ongoing feedback to the treating clinician. MBC especially needed for that addresses internalizing and externalizing problems, which are common among treatment-seeking youths. A very brief measure needed, administration, generating both youth- caregiver-reports, meeting psychometric standards, available at no cost. We developed such a monitor response...