[R] chi-Squared distribution

[Dimitris Rizopoulos]

if you check ?qchisq, you'll see that the second argument of the 
function denotes the non-centrality parameter! Try

qchisq(0.75, 1:3)

to get your answer.

Best,
Dimitris

----
Dimitris Rizopoulos
Ph.D. Student
Biostatistical Centre
School of Public Health
Catholic University of Leuven

Address: Kapucijnenvoer 35, Leuven, Belgium
Tel: +32/16/336899
Fax: +32/16/337015
Web: http://www.med.kuleuven.ac.be/biostat
     http://www.student.kuleuven.ac.be/~m0390867/dimitris.htm


----- Original Message ----- 
From: "Prasanna Balaprakash" <pbalapra at ulb.ac.be>
To: <r-help at stat.math.ethz.ch>
Sent: Friday, January 21, 2005 12:27 PM
Subject: [R] chi-Squared distribution


> Dear Rs:
>
>
> outer(1:3, 1:3, function(df1, df2) qf(0.95, df1, df2))
>
> I compare this F distribution results with the table, the answers 
> were perfect. But I need to see for chi-sqaured distribution. When I 
> employed the similar formula
>
> outer(1:3, 1:3, function(df1, df2) qchisq(0.95, df1, df2)) , I am 
> getting unexpected results. I need to see the following values:
>
>     p=0.750  .....
> 1     1.323
>
> 2     2.773
>
> 3     4.108
>
>
> Thanking you
> Prasanna
>
>
>
>
>
>
> Prasanna Balaprakash,
> Université Libre de Bruxelles,
> 50, Av. F. Roosevelt, CP 194/6,
> B-1050 Brussels,
> Belgium.
>
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