Installation package
install.packages("lavaan", dependencies = TRUE) # 安装lavaan包
library(lavaan) # 载入lavaan包
The tutorial
link of the lavaan package: link
If something like
> install.packages("semPlot", dependencies = TRUE)
trying URL 'https://cran.rstudio.com/bin/windows/contrib/4.3/semPlot_1.1.6.zip'
Content type 'application/zip' length 348299 bytes (340 KB)
downloaded 340 KB
Follow the given link to download the compressed package, and then install it with the following code
install.packages("path/to/semPlot_1.1.6.zip", repos = NULL)