Dear all,
I am trying to write a Microsoft Excel function that will check for outlying within-group variance using the Cochran's C test. What I would like to do is to compute the p-value associated with the Cochran's statistics ratio. Could someone therefore please tell me what the Cochran's C cumulative distribution function is. I have searched Google and other engines but o no avail.
Thanks
Mike Griffiths
Michael Griffiths, Ph.D.
Chemometrician
Training, Quality and Statistics Group
LGC Limited
Queens Road
Teddington
Middlesex, TW11 0LY, UK
Tel: +44 (0)20 8943 7352
Fax: +44 (0)20 8943 2767
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>>> Max Blumberg <[log in to unmask]> 09/12/05 11:53 am >>>
Hi
Can anyone please offer any advice, techniques or references for using
cluster analysis for identifying outliers in multivariate data?
The reason I am looking is that I have collected my data over the Internet
(1300 participants providing five NEO personality scales, 12 marital
satisfaction scales and one conflict scale). But at least one participant
has suggested that he has responded randomly and misleadingly. I therefore
wish to try and remove such cases.
Normal outlier detection is not effective as it is the multivariate cases
that cause the most trouble. Someone suggested that cluster analysis (a new
technique for me) would be effective for this.
Many thanks
Max
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