Weight diagrams and the hat matrix for a local regression model.
hatmatrix() computes the weight diagrams (also known as
equivalent or effective kernels) for a local regression smooth.
Essentially, hatmatrix() is a front-end to locfit(),
setting a flag to compute and return weight diagrams, rather than the
fit.
hatmatrix(formula, dc=TRUE, ...)
formula |
model formula. |
dc |
derivative adjustment (see |
... |
Other arguments to |
A matrix with n rows and p columns; each column being the
weight diagram for the corresponding locfit fit point.
If ev="data", this is the transpose of the hat matrix.
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