16-03-2011, 11:53 AM
PRESENTED BY:
Dr J Maiti
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An Application of Structural Equation Modeling in Evaluating Accident/Injury Occurrences in Underground Coal Mines
Introduction
The purpose of this presentation is to show how Structural Equation Modeling (SEM) can be applied to real life problem solving.
Stages in SEM
• Stage 1: Developing a Theoretically Based
Model
• Stage 2: Constructing a Path Diagram of Causal Relationships
– Elements of a Path Diagram
– Examples of Path Diagrams
– Basic Terminology
– Assumptions of Path Diagrams
• Stage 3: Converting the Path Diagram into a Set of Structural Equations and Specifying the Measurement Model
– Structural Model
– Measurement Model
• Correspondence to Factor Analysis
• Specifying the Measurement Model
• Determining the Number of Indicators
• Accounting For Construct Reliability
– Empirically Estimating Reliabilities
– Specifying the Reliabilities
» Single-item Measures
» Use of Validated Scales or Measures
» Two-stage Analysis
» Methods of Specifying the Reliability
– Correlations Among Constructs and Indicators
• Stage 4: Choosing the Input Matrix Type and Estimating the Proposed Model
– Inputting Data
• Assumptions
• Covariances Versus Correlations
• Sample Size
– Model Estimation
• Estimation Technique
• Estimation Processes
• Computer Programs
• Stage 5: Assessing the Identification of the Structural Model
• Stage 6: Evaluating Goodness-of-Fit Criteria
– Offending Estimates
– Overall Model Fit
– Measurement Model Fit
• Composite Reliability
• Variance Extracted
– Structural Model Fit
– Comparison of Competing or Nested Models