We present some theoretical results which simplifies the estimation of linear models with multiple high-dimensional fixed effects. In particular, we show how to sweep out multiple fixed effects from the normal equations, in analogy with the common within-groups estimator

We present some theoretical results which simplifies the estimation of linear models with multiple high-dimensional fixed effects. In particular, we show how to sweep out multiple fixed effects from the normal equations, in analogy with the common within-groups estimator.