[R] Structural equation modeling in R(lavaan,sem)

From: jouba <antrael_at_hotmail.com>
Date: Sun, 27 Mar 2011 12:12:19 -0700 (PDT)

I am a new user of the function sem in package sem and lavaan for structural equation modeling
1. I don’t know what is the difference between this function and CFA function, I know that cfa for confirmatory analysis but I don’t know what is the difference between confirmatory analysis and structural equation modeling in the package lavaan.
2. I have data that I want to analyse but I have some missing data I must to impute these missing data and I use this package or there is a method that can handle missing data (I want to avoid to delete observations where I have some missing data)
3. I have to use variables that arn’t normally distributed , even if I tried to do some transformation to theses variables t I cant success to have normally distributed data , so I decide to work with these data non normally distributed, my question my result will be ok even if I have non normally distributd data.
4. If I work with the package ggm for separation d , without latent variables we will have the same result as SEM function I guess 5. How about when we have the number of observation is small n, and what is the method to know that we have the minimum of observation required??

Thanks a lot

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