[R] Simple 95% confidence interval for a median

From: Georgina Imberger <gimberger_at_gmail.com>
Date: Thu, 12 May 2011 15:36:14 +0200


Hi!

I have a data set of 86 values that are non-normally distributed (counts).

The median value is 10. I want to get an estimate of the 95% confidence interval for this median value.

I tried to use a one-sample Wiolcoxin test:

wilcox.test(Comps,mu=10,conf.int=TRUE)

and got the following output:

 Wilcoxon signed rank test with continuity correction

data: Comps
V = 2111, p-value = 0.05846
alternative hypothesis: true location is not equal to 10 95 percent confidence interval:
 10.00000 17.49993
sample estimates:
(pseudo)median

      12.50006

I wonder if someone would mind helping me out?

What am I doing wrong?
What is the '(psuedo)median'?
Can I get R to estimate the confidence around the actual median of 10?

With thanks,
Georgie

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