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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

Dear all, I have data that contain more than 30 variables and 600 observations, it?s a longitudinal data,data contains a lot of non normal data (despite trying to do some transformation i hav still nonnormal variables ) i have a lot of missing data, i want to impute these missing data , i wonder if There is some specifications and some manner to impute missing data for a data where