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ALLSTAT  December 2008

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Subject:

Simple question - I hope!

From:

"Clarke,Graham Stirrat" <[log in to unmask]>

Reply-To:

Clarke,Graham Stirrat

Date:

Tue, 2 Dec 2008 13:05:39 +0000

Content-Type:

text/plain

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Parts/Attachments

text/plain (85 lines)

Dear All,

Apologies if this is too simple a question for the list, but I would
very much appreciate any advice you can give.

A colleague of mine has a data set which is the proportion that
various items are chosen from a list. Results were obtained from
subjects on four different occasions. There was a control and an
‘intervention’ group.

My colleague wishes to use repeated measures ANOVA to determine
whether item by item there are changes in the choices made with time
and whether the changes differ between control and intervention
groups

The data however is extremely non-normal, mostly due to the fact that
for every item on the list the modal value is zero on each occasion.

I’ve tried, to no avail, to normalise the data using a range of
transformations including arcsine – square root.

So the question, how should I proceed with the analysis from here?

Once again apologies if this question is too basic.

Thanks

Graham
-- 
Dr G.S.Clarke				               Dr G S Clarke
Lecturer in Physiology			   Darlithydd mewn Ffisioleg
  & Biometry				           a Biometreg
UWB Teaching Fellow			         Cymrawd Addysgu PCB
School Of Healthcare Sciences		Ysgol Gwyddorau Gofal Iechyd
College of Health			      Coleg Gwyddorau Iechyd
  & Behavioural Sciences			        ac Ymddygiad
University of Bangor		      		     Prifysgol Bangor
Fron Heulog				                  Fron Heulog
Ffriddoedd Road				            Ffordd Ffriddoedd
Bangor					                       Bangor
Gwynedd LL57 2EF			             Gwynedd LL57 2EF

Tel: 	01248 383157			         Ffôn:   01248 383157
e-mail: [log in to unmask]		e-bost: [log in to unmask]











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