# Linear Group Fixed Effects

## Documentation for package ‘lfe’ version 3.1.1

- DESCRIPTION file.
- User guides, package vignettes and other documentation.
- Package NEWS.

## Help Pages

lfe-package | Overview. Linear Group Fixed Effects
..oldfelm | Fit a linear model with multiple group fixed effects (old interface)
bccorr | Compute limited mobility bias corrected correlation between fixed effects
btrap | Bootstrap standard errors for the group fixed effects
cgsolve | Solve a symmetric linear system with the conjugate gradient method
chainsubset | Chain subset conditions
compfactor | Find the connected components
condfstat | Compute conditional F statistic for weak instruments in an IV-estimation with multiple endogenous variables
demeanlist | Centre vectors on multiple groups
efactory | Create estimable function
felm | Fit a linear model with multiple group fixed effects
fepois | Fit a Poisson model with multiple group fixed effects
fevcov | Compute limited mobility bias corrected covariance matrix between fixed effects
getfe | Retrieve the group fixed effects
is.estimable | Verify estimability of function
kaczmarz | Solve a linear system defined by factors
lfe | Overview. Linear Group Fixed Effects
makeDmatrix | Make sparse matrix of dummies from factor list
mctrace | Compute trace of a large matrix by sample means
nlexpect | Compute expectation of a function of the coefficients.
sargan | Compute Sargan's S
summary.felm | Summarize felm model fits
varvars | Compute the variance of the fixed effect variance estimate
waldtest | Compute Wald test for joint restrictions on coefficients