Re: [R] Coefficients of Logistic Regression from bootstrap - how to get them?

From: Doran, Harold <HDoran_at_air.org>
Date: Mon, 21 Jul 2008 16:39:06 -0400


Well, here is a good source--wikipedia.  

http://en.wikipedia.org/wiki/Bootstrapping_(statistics)


	From:  [mailto:jerryliu4u_at_gmail.com] 
	Sent: Monday, July 21, 2008 3:56 PM
	To: Doran, Harold
	Cc: Michal Figurski; Frank E Harrell Jr; r-help_at_r-project.org
	Subject: Re: [R] Coefficients of Logistic Regression from bootstrap - how to get them?
	
	
	Hi Doran,
	 
	Maybe I am wrong, but I think bootstrap is a general resampling method which can be used for different purposes...Usually it works well when you do not have a presentative sample set (maybe with limited number of samples). Therefore, I am positive with Michal...
	 
	P.S., overfitting, in my opinion, is used to depict when you got a model which is quite specific for the training dataset but cannot be generalized with new samples......
	 
	Thanks,
	 
	--Jerry
	
	2008/7/21 Doran, Harold <HDoran_at_air.org>:
	


> I used bootstrap to virtually increase the size of my
> dataset, it should result in estimates more close to that
> from the population - isn't it the purpose of bootstrap?
No, not really. The bootstrap is a resampling method for variance estimation. It is often used when there is not an easy way, or a closed form expression, for estimating the sampling variance of a statistic. ______________________________________________ R-help_at_r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. [[alternative HTML version deleted]]

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