Extract Model Syntax

[Joseph Bonito]

Hi All,

I've searched lavaan's output structure so that I can retrieve the model syntax.  I see bits and pieces in the structure but not the actual syntax object.  For example:

model <- ' 
# latent variable definitions 
ind60 =~ x1 + x2 + x3 
dem60 =~ y1 + y2 + y3 + y4 
dem65 =~ y5 + y6 + y7 + y8 
# regressions 
dem60 ~ ind60 dem65 ~ ind60 + dem60 
# residual covariances 
y1 ~~ y5 y2 ~~ y4 + y6 y3 ~~ y7 y4 ~~ y8 y6 ~~ y8 ' 

fit <- sem(model, data=PoliticalDemocracy) 
summary(fit)

Is there a way to retrieve the syntax, including the latent variable definitions, regressions, and residuals, as an intact object that I can reuse it in subsequent models?  Thanks in advance.  

Joe

[Christopher D Desjardins]

Have you looked at

str(fit)
parameterestimates(fit)
residuals(fit)
?inspect

For model syntax, can't you just use the model object you previously defined?

You likely just need to write your own function to extract the specific pieces you're interested in and combine them in the format you want. Shouldn't be too hard.

Chris

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[Joseph Bonito]

Thanks, Chris.  Yes, reusing the object occurred to me after I posted.  And as you surmised, I'm writing a function to reuse the pieces.  I just made it harder than it needed to be.

Joe