I already updated all packages using update.package() and made sure the lmtest package is installed. But the error message of "don't have function lrtest()" still keeps showing up. I have no idea why this happens. Any advice would be appreciated!
Installing packages is necessary for your environment to possibly have access to package functions. However every r session in which you want to use the package, you must load the package into memory, by either require() or library() functions
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