[R] How to use PC1 of PCA and dim1 of MCA as a predictor in logistic regression model for data reduction

[Mark Difford]

On Aug 18, 2011; Daniel Malter wrote:

> Pooling nominal with numeric variables and running pca on them sounds like
> conceptual 
> nonsense to me.

Hi Daniel,

This is not true. There are methods that are specifically designed to do a
PCA-type analysis on mixed categorical and continuous variables, viz
dudi.mix and dudi.hillsmith in package ade4. De Leeuw's homals method takes
this a step further, doing amongst other things, a non-linear version of PCA
using any type of variable.

Regards, Mark.

-----
Mark Difford (Ph.D.)
Research Associate
Botany Department
Nelson Mandela Metropolitan University
Port Elizabeth, South Africa
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