Estimating Fixed Effects Individual Slope Models
Bootstrapped Regression Test
Detrend data by individual slopes
Fixed Effects Individual Slope Estimator
Estimating Fixed Effects Individual Slope Models
Artificial Regression Test
model.matrix for feis objects
A function to extract the model.response
Predict method for feis models
Extract individual slopes
Summary for feis objects
Summary for feistest and bsfeistest objects
Calculate Variance-Covariance Matrix for feis models
Provides the function feis() to estimate fixed effects individual slope (FEIS) models. The FEIS model constitutes a more general version of the often-used fixed effects (FE) panel model, as implemented in the package 'plm' by Croissant and Millo (2008) <doi:10.18637/jss.v027.i02>. In FEIS models, data are not only person demeaned like in conventional FE models, but detrended by the predicted individual slope of each person or group. Estimation is performed by applying least squares lm() to the transformed data. For more details on FEIS models see Bruederl and Ludwig (2015, ISBN:1446252442); Frees (2001) <doi:10.2307/3316008>; Polachek and Kim (1994) <doi:10.1016/0304-4076(94)90075-2>; Ruettenauer and Ludwig (2020) <doi:10.1177/0049124120926211>; Wooldridge (2010, ISBN:0262294354). To test consistency of conventional FE and random effects estimators against heterogeneous slopes, the package also provides the functions feistest() for an artificial regression test and bsfeistest() for a bootstrapped version of the Hausman test.