Re: R-beta: quantile

Ben Bolker (ben@eno.Princeton.EDU)
Thu, 26 Feb 1998 17:59:29 -0500 (EST)


Date: Thu, 26 Feb 1998 17:59:29 -0500 (EST)
From: Ben Bolker <ben@eno.Princeton.EDU>
To: Bill Simpson <wsimpson@uwinnipeg.ca>
Subject: Re: R-beta: quantile
In-Reply-To: <Pine.OSF.3.95.980226162931.23893A-100000@io.uwinnipeg.ca>


  The experimental method:

> x _ rnorm(1000)
> quantile(x,c(0.02,0.025,0.975,0.98))
       2%        2%       98%       98% 
-1.824218 -1.782416  1.932281  2.013865

  Looks like everything is OK.

On Thu, 26 Feb 1998, Bill Simpson wrote:

> I do:
> x<-rnorm(1000)
> quantile(x,c(.025,.975))
>        2%       98% 
> -1.844753  1.931762 
> 
> Since I want to find a 95% confidence interval, I take the .025 and .975
> quantiles.  HOWEVER R says I have the 2% (not 2.5%) and 98% (not 97.5%)
> points.  Is it just rounding the printed 2% and 98%, or is it REALLY
> finding .02 and .98 points instead of .025 and .975?
> 
> Thanks for any help.
> 
> Bill Simpson
> 
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Benjamin Bolker          Dep't of Ecology and Evolutionary Biology,
ben@eno.princeton.edu    Princeton University
tel: (609) 258-6886,     fax: (609) 258-1334

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