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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