Re: R-beta: CI for median in funtion boxplot

Peter Dalgaard BSA (p.dalgaard@biostat.ku.dk)
04 Apr 1998 12:58:54 +0200


To: Rick White <rick@stat.ubc.ca>
Subject: Re: R-beta: CI for median in funtion boxplot
From: Peter Dalgaard BSA <p.dalgaard@biostat.ku.dk>
Date: 04 Apr 1998 12:58:54 +0200
In-Reply-To: Rick White's message of Sat, 04 Apr 1998 00:59:07 +0000

Rick White <rick@stat.ubc.ca> writes:

> 
> I noticed that boxplot computes a 95% CI for the median by using
> median +/- 1.58*IQR./sqrt(n)
> 
> Where does the 1.58 constant come from?
> 

Search me... However, wouldn't it be better in any case to do an exact
95% CI based on the binomial distribution? Of course, you need at
least 6 observations to do that.

-- 
   O__  ---- Peter Dalgaard             Blegdamsvej 3  
  c/ /'_ --- Dept. of Biostatistics     2200 Cph. N   
 (*) \(*) -- University of Copenhagen   Denmark      Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard@biostat.ku.dk)             FAX: (+45) 35327907

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