lscv.exact {locfit} | R Documentation |

## Exact LSCV Calculation

### Description

This function performs the exact computation of the least squares
cross validation statistic for one-dimensional kernel density estimation
and a constant bandwidth.

At the time of writing, it is implemented only for the Gaussian
kernel (with the standard deviation of 0.4; Locfit's standard).

### Usage

lscv.exact(x, alpha, ...)

### Arguments

`x` |
Numeric data vector |

`alpha` |
The bandwidth. Note that this function only works with
a constant bandwidth, and in accordance with Locfit's standard, this
can be specified as `alpha=c(0,h)` . It can also be given as
a single number, which will be interpreted as a constant
(not NN) bandwidth. |

`...` |
not used. |

### Value

A vector of the LSCV statistic and the fitted degrees of freedom.

### See Also

`lscv`

,
`lscvplot`

### Examples

data(geyser)
lscv.exact(geyser,alpha=0.25)
# equivalent form using lscv
lscv(geyser,alpha=0.25,exact=TRUE)

[Package

*locfit* version 1.1-9

Index]