Nothing
Transforms away factors with many levels prior to doing an OLS. Useful for estimating linear models with multiple group fixed effects, and for estimating linear models which uses factors with many levels as pure control variables. Includes support for instrumental variables, conditional F statistics for weak instruments, robust and multiway clustered standard errors, as well as limited mobility bias correction.
Package details 


Author  Simen Gaure [aut, cre] (<https://orcid.org/0000000172518747>) 
Maintainer  Simen Gaure <[email protected]> 
License  Artistic2.0 
Version  2.83 
URL  https://github.com/sgaure/lfe 
Package repository  View on CRAN 
Installation 
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