Path Analysis for Exploring EBM Science Frameworks
Andy and Irit
Path Analysis
Linear models between observed and/or latent variables
Include direct and indirect effects
Exploratory path analysis and confirmatory factor analysis
Software – Lisrel, Amos
Path Analysis
Latent variables – unobserved constructs that are key features of the system
Could be used to define services – conceptual issue is how are services defined or treated
Observed variables can be affected by latent variables or vice versa
Path Analysis
Because of the linear structure, probably most appropriate for exploring interactions and feedback loops, not necessarily modeling generation of services
Confirmatory form less useful in our context?
Path Analysis- issues
There are infinite number of diagrams, need to determine critical indirect effects for exploration
Serious problem of statistically identifying parameters.
Need to have a more complete data set and work on replication issue – beyond time series data

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