[R] Bootstrapping Confidence Intervals for Medians

From: <gilbertg_at_musc.edu>
Date: Sat 06 Jan 2007 - 05:19:10 GMT


I apologize for this post. I am new to R (two days) and I have tried and tried to calculated confidence intervals for medians. Can someone help me?

Here is my data:

institution1

0.21
0.16
0.32
0.69
1.15
0.9
0.87
0.87
0.73

The first four observations compose group 1 and observations 5 through 9 compose group 2. I would like to create a bootstrapped 90% confidence interval on the difference of the medians (n2-n1). I have successfully calculated a permutation test.

This shouldn't be as difficult as I am making it, would someone please enlighten me?

Please reply to gilbertg@musc.edu as I have not subscribed to this list yet.

TIA, Greg Gilbert, Faculty Research Associate Department of Biostatistics, Bioinformatics, & Epidemiology Medical University of South Carolina



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