hatmatrix {locfit} | R Documentation |

## Weight diagrams and the hat matrix for a local regression model.

### Description

`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.

### Usage

```
hatmatrix(formula, dc=TRUE, ...)
```

### Arguments

`formula` |
model formula. |

`dc` |
derivative adjustment (see |

`...` |
Other arguments to |

### Value

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.

### See Also

`locfit`

, `plot.locfit.1d`

, `plot.locfit.2d`

,
`plot.locfit.3d`

, `lines.locfit`

, `predict.locfit`

[Package

*locfit*version 1.5-9.10 Index]