Message-ID: <20050415004428.4f7a5938.0034058@fudan.edu.cn>
Date: 2005-04-14T16:44:28Z
From: ronggui
Subject: solved
In-Reply-To: <20050413214744.59a01d52.0034058@fudan.edu.cn>
i have find the answer to this question.
sorry for my overlook the information about it in internet.
> 2,as some textbook say,when using fisher's method,"we proceed by assuming that the within-group covariance structure for our data is the same across groups",so we need test for equailty of covariance matrices. my question is :when i using lda,should i test equailty of covariance matrices first? and can R do these?
the box's m test is the way for this purpose,but the test does not have good property.so it is not worthwhile for us the do the test.