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| lfe-package | Linear Group Fixed Effects |
| btrap | Bootstrap standard errors for the group fixed effects |
| compfactor | Find the connected components |
| demeanlist | Centre vectors on multiple groups |
| efactory | Create estimable function |
| felm | Fitting linear models with multiple group fixed effects |
| getfe | Retrieve the group fixed effects |
| is.estimable | Verify estimability of function |
| kaczmarz | Solve a linear system defined by factors |
| lfe | Linear Group Fixed Effects |