# Re: correlations of ordered residuals with their expected values.

*From*: "Anon." <bob.ohara@xxxxxxxxxxx>*Date*: Thu, 22 Feb 2007 07:50:57 +0200

Isabelle wrote:

I am working on a one way ANOVA. I am asked to do the following :

"compute the correlation between the ordered residuals and their

expected values under normality"

(this analysis appears to be related to the checking of the

assumption of normality of the residuals)

I know how to order the residuals. But I do not understand the part

about the expected value of the residuals under normality. I thought

that residuals were normally distributed about zero, which does not

make sense in these instructions.

Can anybody help me?

The residuals are ordered, so you're being asked about the expected value of the smallest, second smallest, etc. If you have two residuals, then the smallest of them will have an expected value less than zero (because the expected value of their sum is zero).

HTH

Bob

--

Bob O'Hara

Department of Mathematics and Statistics

P.O. Box 68 (Gustaf Hällströmin katu 2b)

FIN-00014 University of Helsinki

Finland

Telephone: +358-9-191 51479

Mobile: +358 50 599 0540

Fax: +358-9-191 51400

WWW: http://www.RNI.Helsinki.FI/~boh/

Journal of Negative Results - EEB: www.jnr-eeb.org

.

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