PP3 (version 1.2)

getPP3loadings: Extract projection loadings from a PP3 object.

Description

Extract projection loadings (directions) from a PP3 object.

Usage

getPP3loadings(PP3, number)

Arguments

PP3

The PP3 object.

number

which projection solution you want to get.

Value

A matrix of dimensional 3xK, where K was the original dimensionality of the input data set. Note: they are not an orthogonal set, but the back transform of an orthogonal set (back transformed from the inverse sphering transform).

Details

Gets projection directions associated with a particular solution from the nrandstarts that PP3many produces.

References

Friedman, J.H. and Tukey, J.W. (1974) A projection pursuit algorithm for exploratory data analysis. IEEE Trans. Comput., 23, 881-890.

Jones, M.C. and Sibson, R. (1987) What is projection pursuit? (with discussion) J. R. Statist. Soc. A, 150, 1-36.

Nason, G. P. (1995) Three-dimensional projection pursuit. J. R. Statist. Soc. C, 44, 411-430.

Nason, G. P. (2001) Robust projection indices. J. R. Statist. Soc. B, 63, 551-567.

See Also

getPP3index, PP3many

Examples

# NOT RUN {
#
# See example for getPP3index in the help for PP3many, this function
# works similarly but returns loadings rather than indices.
#
# }