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Extracts the bread matrix from fixest objects to be used to compute sandwich variance-covariance matrices.
# S3 method for fixest bread(x, ...)
Returns a matrix of the same dimension as the number of variables used in the estimation.
A fixest object, obtained for instance from feols.
fixest
feols
Not currently used.
est = feols(Petal.Length ~ Petal.Width + Sepal.Width, iris) bread(est)
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