fRegress.CV | R Documentation |

For a functional regression model, a cross-validated error sum of
squares is computed. For a functional dependent variable this is the
sum of integrated squared errors. For a scalar response, this function
has been superseded by the OCV and gcv elements returned by
`fRegress`

. This function aids the choice of smoothing parameters
in this model using the cross-validated error sum of squares
criterion.

```
#fRegress.CV(y, xfdlist, betalist, wt=NULL, CVobs=1:N,
# returnMatrix=FALSE, ...)
#NOTE: The following is required by CRAN rules that
# function names like "as.numeric" must follow the documentation
# standards for S3 generics, even when they are not.
# Please ignore the following line:
## S3 method for class 'CV'
fRegress(y, xfdlist, betalist, wt=NULL, CVobs=1:N,
returnMatrix=FALSE, ...)
```

`y` |
the dependent variable object. |

`xfdlist` |
a list whose members are functional parameter objects specifying functional independent variables. Some of these may also be vectors specifying scalar independent variables. |

`betalist` |
a list containing functional parameter objects specifying the regression functions and their level of smoothing. |

`wt` |
weights for weighted least squares. Defaults to all 1's. |

`CVobs` |
Indices of observations to be deleted. Defaults to 1:N. |

`returnMatrix` |
logical: If TRUE, a two-dimensional is returned using a special class from the Matrix package. |

`...` |
optional arguments not used by |

A list containing

`SSE.CV` |
The sum of squared errors, or integrated squared errors |

`errfd.cv` |
Either a vector or a functional data object giving the cross-validated errors |

Ramsay, James O., Hooker, Giles, and Graves, Spencer (2009),
*Functional data analysis with R and Matlab*, Springer, New York.

Ramsay, James O., and Silverman, Bernard W. (2005),
*Functional Data Analysis, 2nd ed.*, Springer, New York.

Ramsay, James O., and Silverman, Bernard W. (2002),
*Applied Functional Data Analysis*, Springer, New York.

`fRegress`

,
`fRegress.stderr`

```
#. See the analyses of the Canadian daily weather data.
```

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