R help - Dec 2004 - Confidence Intervals from Bootstrap Replications

Hi All:

I have to compute bootstrap confidence intervals, the statistic
(incremental cost effectiveness ratio) is computed from two samples
(intervention and control) of different sizes. All the bootstrap
functions that I have seen use one dataset as argument. I may go ahead
and get the desired number of bootstrap replications separately. I would
appreciate if you could point me to a source of a bootstrap function (if
available) that takes the B bootstrap replications and other descriptive
statistics and can get me the confidence intervals. Please write me if I
have not been clear in explaining my problem. Regards,

Ashraf  

 

___________________________________

M. Ashraf Chaudhary, Ph.D.

Associate Scientist/Biostatistician

Department of International Health

Disease Prevention and Control Program

Johns Hopkins University Bloomberg School of Public Health

615 North Wolfe Street, Room W5506

Baltimore MD 21205

 

mchaudha@jhsph.edu 

Phone: (410) 502-0741/Fax: (410) 502-6733

http://faculty.jhsph.edu/?F=Mohammad&L=Chaudhary

 

 


	[[alternative HTML version deleted]]

See , e.g. section 8.3 "The two-sample problem" of Efron and
Tibshirani's AN
INTRODUCTION TO THE BOOTSTRAP. It makes it clear there why one just
bootstrap samples independently from the two separate samples.

The "strata" argument of boot() in the boot package allows one to do
such
independent sampling and use the capabilities of that function.

-- Bert Gunter
Genentech Non-Clinical Statistics
South San Francisco, CA
 
"The business of the statistician is to catalyze the scientific learning
process."  - George E. P. Box
 
 
> -----Original Message-----
> From: r-help-bounces at stat.math.ethz.ch 
> [mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of 
> Mohammad A. Chaudhary
> Sent: Friday, December 17, 2004 2:39 PM
> To: r-help at stat.math.ethz.ch
> Subject: [R] Confidence Intervals from Bootstrap Replications 
> 
> Hi All:
> 
> I have to compute bootstrap confidence intervals, the statistic
> (incremental cost effectiveness ratio) is computed from two samples
> (intervention and control) of different sizes. All the bootstrap
> functions that I have seen use one dataset as argument. I may go ahead
> and get the desired number of bootstrap replications 
> separately. I would
> appreciate if you could point me to a source of a bootstrap 
> function (if
> available) that takes the B bootstrap replications and other 
> descriptive
> statistics and can get me the confidence intervals. Please 
> write me if I
> have not been clear in explaining my problem. Regards,
> 
> Ashraf  
> 
>  
> 
> ___________________________________
> 
> M. Ashraf Chaudhary, Ph.D.
> 
> Associate Scientist/Biostatistician
> 
> Department of International Health
> 
> Disease Prevention and Control Program
> 
> Johns Hopkins University Bloomberg School of Public Health
> 
> 615 North Wolfe Street, Room W5506
> 
> Baltimore MD 21205
> 
>  
> 
> mchaudha at jhsph.edu 
> 
> Phone: (410) 502-0741/Fax: (410) 502-6733
> 
> http://faculty.jhsph.edu/?F=Mohammad&L=Chaudhary
> 
>  
> 
>  
> 
> 
> 	[[alternative HTML version deleted]]
> 
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