I am new to R/RStudio. In SAS/SPSS, it is very easy to apply sample/case weighting to any multivariate analysis e.g. multiple regression, factor analysis, cluster analysis, etc. Are there R packages that can be used to run weighted multivariate analysis such as multiple regression, factor analysis, etc.?
Take a look at the survey package and specifically the svyglm function if you're looking for weighted linear modeling. If you're doing a lot of work with survey weighted data, you might also be interested in the srvyr package, which is an updated version of survey that has dplyr like syntax.