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  3. Structural Equation Modeling with lavaan in R

Exercise

Create a Zero df Model

In the first chapter, we created a model of text-speed from the HolzingerSwineford1939 dataset with six manifest variables x4, x5, x6, x7, x8, x9. Create a model of only reading comprehension with x4, x5, and x6.

This model should have zero degrees of freedom because it is not identified, as we are estimating as many parameters as we have options with only three manifest variables. Analyze the model to find zero degrees of freedom. lavaan and the HolzingerSwineford1939 dataset have been loaded for you.

Instructions

100 XP
  • Name your model text.model and your latent variable text.
  • Use variables x4, x5, and x6 as the manifest variables.
  • Use the cfa() function to analyze the model.
  • Use the summary() function to view the degrees of freedom.