Description Usage Arguments Details Value Author(s) See Also Examples

If a dimension reduction object has *p* dimension, returns a *p \times r*
matrix whose columns space a subspace specified by a formula.

1 | ```
coord.hyp.basis(object, spec, which = 1)
``` |

`object` |
A |

`spec` |
A one-sided formula, see below |

`which` |
either +1 or |

The workings of this function is best explained by an example. Suppose
the `dr`

object was created with the formula `y~x1+x2+x3+x4`

, so
we have *p=4* predictors. A matrix that spans the subspace of
*R^4* specified
by Span(x1,x2,x3,x4) is simply the identity matrix of order 4.

This function will return a subset of the columns of this identity matrix,
as determined by `spec`

. For example, if `spec = ~.-(x3+x4)`

, the
function returns the columns corresponding to x1 and x2 if `which=+1`

or the
columns corresponding to x3 and x4 if which=*-1*. Similarly, if
`spec=~x1+x2`

, the same matrices will be returned.

A matrix corresponding to the value of `spec`

and `which`

given.

Sanford Weisberg, sandy@stat.umn.edu

1 2 3 4 5 |

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