How to use PCA to handle continuous and discrete variables?

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Hi,

How to use PCA (Principle component analysis) to deal with continuous and discrete variables at the same time?
SPSS has one offer "Categorial component analysis". Is that the correct method? But it is too complicated to initiate all the options.
Do u have some tutorial about this topic?

Is there anyone having the same problem? How do u solve the question?
Any suggestion will be really appreciated and helpful.
Thank u very much for ur time and concern. :) Look forward to ur opinions.

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关键词：Continuous Variables Discrete Variable handle How Continuous Discrete pca handle

Categorial component analysis是针对分类变量的，在spss的帮助文档中有相关的案例可以参考。

在人大经济论坛的pasw课程中，有个非线性典型相关分析跟Categorial component analysis
比较相似。。