Structural Equation Modeling With Ωnyx

Published on Jan 2, 2015in Structural Equation Modeling3.638
· DOI :10.1080/10705511.2014.935842
Timo von Oertzen21
Estimated H-index: 21
(MPG: Max Planck Society),
Andreas M. Brandmaier17
Estimated H-index: 17
(MPG: Max Planck Society),
Siny Tsang14
Estimated H-index: 14
(UVA: University of Virginia)
Sources
Abstract
Ωnyx is a free software environment for creating and estimating structural equation models (SEM). It provides a graphical user interface that facilitates an intuitive creation of models, and a powerful back end for performing maximum likelihood estimation of parameters. Path diagrams in Ωnyx can be exported to OpenMx, lavaan, and Mplus to allow an easy transition to script-based SEM software. Also, OpenMx scripts can be transformed into a path diagrams in Ωnyx. In addition to the graphical user interface, Ωnyx provides a maximum likelihood optimizer that finds multiple minima and does not require the user to provide starting values. To our knowledge, Ωnyx is the only SEM program that provides multiple optima. This article describes both the graphical and conceptual features of Ωnyx, including the optimization approach, and demonstrates two hands-on modeling examples.
📖 Papers frequently viewed together
7,661 Citations
123 Citations
106 Citations
References8
Newest
Structural equation modeling (SEM) is a vast field and widely used by many applied researchers in the social and behavioral sciences. Over the years, many software packages for structural equation modeling have been developed, both free and commercial. However, perhaps the best state-of-the-art software packages in this field are still closed-source and/or commercial. The R package lavaan has been developed to provide applied researchers, teachers, and statisticians, a free, fully open-source, b...
7,661 CitationsSource
#1Timo von Oertzen (MPG: Max Planck Society)H-Index: 21
#2Paolo GhislettaH-Index: 31
Last. Ulman Lindenberger (MPG: Max Planck Society)H-Index: 111
view all 3 authors...
Variability across and within individuals is a fundamental property of adult age changes in behavior [20, 21, 24]. Some people seem young for their age, others seem old; shining examples of older individuals who maintained high levels of intellectual functioning well into very old age, such as Johann Wolfgang von Goethe or Sophocles, stand in contrast to individuals whose cognitive resources are depleted by the time they reach later adulthood. A similar contrast exists between different intellec...
6 CitationsSource
R is free, open-source, cooperatively developed software that implements the S statistical programming language and computing environment. The current capabilities of R are extensive, and it is in wide use, especially among statisticians. The sem package provides basic structural equation modeling facilities in R, including the ability to fit structural equations in observed variable models by two-stage least squares, and to fit latent variable models by full information maximum likelihood assum...
350 CitationsSource
#1Ross Ihaka (University of Auckland)H-Index: 8
#2Robert Gentleman (University of Auckland)H-Index: 58
Abstract In this article we discuss our experience designing and implementing a statistical computing language. In developing this new language, we sought to combine what we felt were useful features from two existing computer languages. We feel that the new language provides advantages in the areas of portability, computational efficiency, memory management, and scoping.
8,938 CitationsSource
#1Peter M. BentlerH-Index: 108
7,562 Citations
#1John J. McArdle (UVA: University of Virginia)H-Index: 71
The term “dynamic” is broadly defined as a pattern of change. Many scientists have searched for dynamics by calculating df/dt: the ratio of changes or differences d in a function f relative to changes in time t.This simple dynamic equation was used in the 16th and 17th century motion experiments of Galileo, in the 17th and 18th century gravitation experiments of Newton, and in the 19th century experiments of many physicists and chemists (see Morris, 1985). I also use this dynamic equation, but h...
534 CitationsSource
A number of models for the analysis of moment structures, such as LISREL, have recently been shown to be capable of being given a particularly simple and economical representation, in terms of the Reticular Action Model (RAM). In contrast to previous treatments, a formal algebraic treatment is provided which shows that RAM directly incorporates many common structural models, including models describing the structure of means. It is also shown here that RAM treats coefficient matrices with patter...
262 CitationsSource
#1Bradley Efron (Stanford University)H-Index: 100
We discuss the following problem given a random sample X = (X 1, X 2,…, X n) from an unknown probability distribution F, estimate the sampling distribution of some prespecified random variable R(X, F), on the basis of the observed data x. (Standard jackknife theory gives an approximate mean and variance in the case R(X, F) = \(\theta \left( {\hat F} \right) - \theta \left( F \right)\), θ some parameter of interest.) A general method, called the “bootstrap”, is introduced, and shown to work satis...
13.1k CitationsSource
Cited By87
Newest
#1Raúl González-Gómez (UAI: Adolfo Ibáñez University)
#2Odir Antonio Rodríguez-Villagra (UCR: University of Costa Rica)H-Index: 4
Last. Sol Fittipaldi (CONICET: National Scientific and Technical Research Council)H-Index: 5
view all 7 authors...
Abstract null null The latent structure of executive functions (EFs) remains controversial. Confirmatory factorial analysis (CFA) has provided support for both multidimensional (assumes EFs to be functionally separable but related components) and bifactor (proposes all components are nested within a common factor) models. However, these CFA models have never been compared in patient samples, nor regarding their neuroanatomical correlates. Here, we systematically contrast both approaches in neuro...
Source
#2Ross JacobucciH-Index: 11
#1Mariana Teles (UVA: University of Virginia)
#2Dingjing Shi (OU: University of Oklahoma)
Source
#1Xueying Qin (KI: Karolinska Institutet)
#2Ida K. KarlssonH-Index: 14
Last. Sara Hägg (KI: Karolinska Institutet)H-Index: 33
view all 7 authors...
Studies on DNA methylation have the potential to discover mechanisms of cardiovascular disease (CVD) risk. However, the role of DNA methylation in CVD etiology remains unclear. We performed an epigenome-wide association study (EWAS) on CVD in a longitudinal sample of Swedish twins (535 individuals). We selected CpGs reaching the Bonferroni-corrected significance level (2 null null null null null null null null null null null null null null null null null null null null null null null null null n...
Source
#1Yves Basset (STRI: Smithsonian Tropical Research Institute)H-Index: 60
#2Leonardo R. Jorge (Sewanee: The University of the South)H-Index: 9
Last. John W. Brown (National Museum of Natural History)H-Index: 21
view all 29 authors...
In the tropics, antagonistic seed predation networks may have different properties than mutualistic pollination and seed dispersal networks, but the former have been considerably less studied. We tested whether the structure of antagonistic tripartite networks composed of host plants, insects developing within seeds and fruits, and their insect parasitoids could be predicted from plant phylogenetic distance and plant traits. We considered subsets of the networks (‘subnetworks') at three rainfore...
Source
#1Matthias Volz (University Hospital Heidelberg)H-Index: 2
#2Johannes C. Ehrenthal (University of Cologne)H-Index: 1
Last. Inge Seiffge-Krenke (University of Mainz)H-Index: 42
view all 3 authors...
OBJECTIVE To determine the treatment effect of psychodynamic therapy for adolescents in comparison to normative developmental progression in two groups without treatment: healthy adolescents and adolescents with juvenile diabetes. RESEARCH DESIGN AND METHODS In a 3-wave longitudinal study, n = 531 adolescents (n = 303 treated adolescents, n = 119 healthy, n = 109 with diabetes) and their parents filled out psychopathology questionnaires (Youth Self-Report [YSR] and Child Behaviour Checklist [CBC...
Source
#1Attila Keresztes (MPG: Max Planck Society)H-Index: 9
#2Laurel Raffington (MPG: Max Planck Society)H-Index: 6
Last. Yee Lee Shing (Goethe University Frankfurt)H-Index: 26
view all 6 authors...
Many cross-sectional findings suggest that volumes of specific hippocampal subfields increase in middle childhood and early adolescence. In contrast, a small number of available longitudinal studies observed decreased volumes in most subfields over this age range. Further, it remains unknown whether structural changes in development are associated with corresponding gains in children9s memory. Here we report cross-sectional age differences in children9s hippocampal subfield volumes together with...
Source
#1Takeshi Taniguchi (Tottori University)H-Index: 11
#2Toshiki Yuzawa (Tottori University)H-Index: 1
Last. Norikazu Yamanaka (Tottori University)H-Index: 19
view all 5 authors...
Abstract Aeolian desertification is the dominant form of land degradation in drylands. The straw checkerboard barrier (SCB) method is effective for sand fixation and has been used to combat aeolian desertification in China. Soil inoculation with ectomycorrhizal (ECM) fungi can help restore degraded lands by improving the soil microbial community and steering plant community development. Combining SCB with afforestation via planting ECM trees and inoculating soil with ECM fungi holds promise for ...
1 CitationsSource
#1Dominik SeidelH-Index: 22
#2Peter AnnighöferH-Index: 17
Last. Daniel P. SotoH-Index: 10
view all 7 authors...
Source
#1Tina Braun (Bundeswehr University Munich)H-Index: 1
#2Timo von Oertzen (Bundeswehr University Munich)H-Index: 21
Assessing the effect mentors have on their mentees is methodologically challenging: most programs merely provide relatively short mentoring durations (typically in the range of 1 year), age ranges are usually rather small, and examining dyads with anything other than questionnaires has proven to be challenging in the past. Thus, although some excellent causal studies do exist, in general causal research is limited in the field and studies are opened up to social desirability. Using a controlled ...
Source