No problem, I'm glad it helped.
If you have any questions, please ask.
Many thanks,
Kriss Harris
________________________________
From: "[log in to unmask]" <[log in to unmask]>
To: Kriss Harris <[log in to unmask]>
Sent: Sat, December 11, 2010 11:07:52 AM
Subject: Re: Naive ANOVA question
Yes, thanks for that
Graham
Quoting Kriss Harris <[log in to unmask]>:
> Hi Graham,
>
> Okay in that case, you can't really analyse the effect of time, i.e.
> before and
> after as that assumes that the results are independent, but actually
> they're not
> as there from the same subjects. You can still look at the effect of
> intervention though as that is between subject. You should split the
> dataset up
> into 2 (before and after) and just use one factor intervention to investigate
> that effect.
>
> Does that sound okay?
> Many thanks,
>
>
> Kriss Harris
>
>
>
>
> ________________________________
> From: "Clarke,Graham Stirrat" <[log in to unmask]>
> To: Kriss Harris <[log in to unmask]>
> Sent: Fri, December 10, 2010 2:34:37 PM
> Subject: Re: Naive ANOVA question
>
> Hi
>
> it is the same individuals who were recorded before and after, we just
> have no way of identifying whose records are whose.
>
> Thanks
>
> Graham
>
> On 10/12/2010 13:32, Kriss Harris wrote:
>> Hi Graham,
>>
>> Just to clarify are the before and after data recorded on the same
>> individuals? If this is the case then what you are doing is acceptable,
>> and all you have to do is add Subject as a factor too.
>>
>> If there are missing values then you could do a more complicated model,
>> and fit subject as a random factor.
>>
>> I hope this helps.
>> Many thanks,
>>
>> Kriss Harris
>>
>>
>> ------------------------------------------------------------------------
>> *From:* "Clarke,Graham Stirrat" <[log in to unmask]>
>> *To:* [log in to unmask]
>> *Sent:* Fri, December 10, 2010 12:03:08 PM
>> *Subject:* Naive ANOVA question
>>
>> Hi,
>>
>> sorry to bother you with what is probably a simple question.
>>
>> I have before and after data on two groups who received different
>> interventions (It isn't repeated measures in the sense that there is no
>> method for associating an individual's before and after result).
>>
>> Is it acceptable to do a factorial ANOVA with before/after as one factor
>> and intervention1/intervention2 the other factor? If not could you
>> please let me know how to approach the problem.
>>
>> Many 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] <mailto:[log in to unmask]> e-bost:
>> [log in to unmask] <mailto:[log in to unmask]>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>> -- Gall y neges e-bost hon, ac unrhyw atodiadau a anfonwyd gyda hi,
>> gynnwys deunydd cyfrinachol ac wedi eu bwriadu i'w defnyddio'n unig
>> gan y sawl y cawsant eu cyfeirio ato (atynt). Os ydych wedi derbyn y
>> neges e-bost hon trwy gamgymeriad, rhowch wybod i'r anfonwr ar
>> unwaith a dilëwch y neges. Os na fwriadwyd anfon y neges atoch chi,
>> rhaid i chi beidio â defnyddio, cadw neu ddatgelu unrhyw wybodaeth a
>> gynhwysir ynddi. Mae unrhyw farn neu safbwynt yn eiddo i'r sawl a'i
>> hanfonodd yn unig ac nid yw o anghenraid yn cynrychioli barn
>> Prifysgol Bangor. Nid yw Prifysgol Bangor yn gwarantu
>> bod y neges e-bost hon neu unrhyw atodiadau yn rhydd rhag firysau neu
>> 100% yn ddiogel. Oni bai fod hyn wedi ei ddatgan yn uniongyrchol yn
>> nhestun yr e-bost, nid bwriad y neges e-bost hon yw ffurfio contract
>> rhwymol - mae rhestr o lofnodwyr awdurdodedig ar gael o Swyddfa
>> Cyllid Prifysgol Bangor. www.bangor.ac.uk<http://www.bangor.ac.uk>
>>
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>
> --
> 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]
>
>
>
>
>
>
>
>
>
>
>
> --
> Gall y neges e-bost hon, ac unrhyw atodiadau a anfonwyd gyda hi,
> gynnwys deunydd cyfrinachol ac wedi eu bwriadu i'w defnyddio'n unig
> gan y sawl y cawsant eu cyfeirio ato (atynt). Os ydych wedi derbyn y
> neges e-bost hon trwy gamgymeriad, rhowch wybod i'r anfonwr ar
> unwaith a dilëwch y neges. Os na fwriadwyd anfon y neges atoch chi,
> rhaid i chi beidio â defnyddio, cadw neu ddatgelu unrhyw wybodaeth a
> gynhwysir ynddi. Mae unrhyw farn neu safbwynt yn eiddo i'r sawl a'i
> hanfonodd yn unig ac nid yw o anghenraid yn cynrychioli barn
> Prifysgol Bangor. Nid yw Prifysgol Bangor yn gwarantu
> bod y neges e-bost hon neu unrhyw atodiadau yn rhydd rhag firysau neu
> 100% yn ddiogel. Oni bai fod hyn wedi ei ddatgan yn uniongyrchol yn
> nhestun yr e-bost, nid bwriad y neges e-bost hon yw ffurfio contract
> rhwymol - mae rhestr o lofnodwyr awdurdodedig ar gael o Swyddfa
> Cyllid Prifysgol Bangor. www.bangor.ac.uk
>
> This email and any attachments may contain confidential material and
> is solely for the use of the intended recipient(s). If you have
> received this email in error, please notify the sender immediately
> and delete this email. If you are not the intended recipient(s), you
> must not use, retain or disclose any information contained in this
> email. Any views or opinions are solely those of the sender and do
> not necessarily represent those of the Bangor University.
> Bangor University does not guarantee that this email or
> any attachments are free from viruses or 100% secure. Unless
> expressly stated in the body of the text of the email, this email is
> not intended to form a binding contract - a list of authorised
> signatories is available from the Bangor University Finance
> Office. www.bangor.ac.uk
>
>
>
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