anita_jiu
[quote]引用第0楼neunux于2007-08-05 22:39发表的“新手请教关于判别分析的问题”:
有一个比较初级的问题。判别分析对case数有要求吗?比如必须多少以上?如果数量比较少,比如10个,但是得到的判别函数显著,并且在判别新样本时正确率在70%以上,是否可以接受?谢谢!![/quote]
Discriminant analysis has requirement regarding the number of cases. The common questions are related to the number of IVs, unequal sample sizes, classification and prediction. There is no explicit answer to your question (i.e. 比如必须多少以上) as it depends on various factors, such as the whole sample size.
Some issues for you to consider: how many IVs do you have? What are the number of cases in each of these IVs? How big is your sample? These questions are vital to justify the outcome of discriminant analysis. I personally belive that it is inappropriate to give any comment on the outcome of your analysis without having a thorough understanding of your research nature, such as the questions mentioned above.
Your second question (i.e. 在判别新样本时正确率在70%以上) is very much depending on the way how you want to classify the cases. which method do you use for classfication, 'prior probability' or 'sample size'? Again, an objective manner is important when you evaluate the outcome of discriminant analysis such as adequate classification rate and 'significant importance'. If you may provide more details regarding the above questions, perhaps more proper discussion and hopefully suggestion may be generated.
Good luck.