ADVANCED STATISTICAL LECTURING SERVICES

WHAT IS SEM?

Structural Equation Modeling (SEM) — which is sometimes called LInear Structural Relationships (LISREL), Analysis of Moment Structures (AMOS), Latent Variable Analysis, Analysis of Covariance Structures, or Causal Modeling — is an umbrella term for a statistical technique that is used widely by researchers in a diverse array of fields to replace many conventional analytical tools such as regression, path analysis, factor analysis, canonical correlation, analysis of variance, analysis of covariance, principal component analysis, classical test theory, and non-recursive econometric modeling.

Essentially, SEM combines factor analysis with path analysis (including simple, multiple, or multivariate regression) to investigate complex relationships amongst observed, measured variables and unobserved, latent variables (or factors), as well as amongst the latent variables themselves. The following diagram demonstrates a typical SEM model:

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WHAT IS MLM?

In conventional regression analysis, it is assumed that subjects are randomly selected — and that therefore all variance in the dependent variables is due solely to variation amongst individuals. However, in many studies, subjects are clustered within a group and multiple groups are sampled. For example, in an education study, we may have students clustered within classes and multiple classes sampled; in a human resourcing study, we may have employees clustered within work units and multiple work units sampled. In such sampling, although some of the variance in the dependent variables will be due to variation amongst individuals, some the variance in the dependent variables will also be due to variation amongst the groups themselves. In such cases, Multi-level Modeling (MLM) should be employed to account for the different levels of variation.

Repeated measure designs should also be analysed using MLM, because the repeated observations are nested within subjects. For example, in a marketing study, we may have repeated measures of consumers’ attitudes to a brand over the life of a marketing campaign; in an epidemiology study, we may have repeated measures of a health outcome over the life of a drug treatment regime. In such studies, although some of the variance in the dependent variables will be due to variation across the various time occasions, some the variance in the dependent variables will also be due to variation amongst individuals themselves. Again, in such cases, Multi-level Modeling (MLM) should be employed to account for the different levels of variation.

WHERE HAS PHILIP TAUGHT

Since 1994, Philip has taught more than 100 ACSPRI courses. In that time, he has enhanced the research capacity of over 1,500 PhD students, university researchers, and researchers from numerous research institutions and government departments. In addition, Philip has been engaged directly by numerous individual university faculties to conduct in-house intensive SEM and/or MLM courses. In that capacity, he has enhanced the research capacity of at least another 1,500 PhD students and university researchers.

In total, Philip has now taught in over half the universities in Australia including the Australian National University, Charles Sturt University, Curtin University of Technology, Deakin University, Edith Cowan University, Griffith University, La Trobe University, Macquarie University, Monash University, RMIT University, Swinburne University of Technology, the University of Adelaide, the University of Melbourne, the University of New England, the University of Newcastle, the University of Queensland, the University of Sydney, the University of Western Australia, University of South Australia, University of Technology Sydney, University of the Sunshine Coast, Victoria University, and Western Sydney University.

COURSES

INTERESTED IN THESE COURSES?

If you are interested in booking Phil, first check his availability. When you have found a suitable date please contact us with your desired date and time and we will get back to you as soon as possible.