Hi - I'm not quite sure what you're asking - but yes you can put 3
groups into TBSS without problem.
Cheers.
On 3 Jun 2008, at 17:39, Longchuan Li wrote:
> Hi Steve,
> Thank you for the reply. Also, if I use these three groups to do
> TBSS analysis, instead of ROI, do I still need to separate them
> instead of putting them together?
>
> Thank you
>
> Longchuan Li
> ----- Original Message ----- From: "Steve Smith"
> <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Tuesday, June 03, 2008 3:34 AM
> Subject: Re: [FSL] about statistics for three groups
>
>
>> Hi,
>>
>> I would just run separate (t-test) comparisons for each pair of
>> groups - this is sensitive to any group differences and very easy
>> to interpret.
>>
>> Cheers.
>>
>>
>>
>> On 2 Jun 2008, at 18:46, Longchuan Li wrote:
>>
>>> Dear FSL experts
>>>
>>> I have a question regarding the statistics of multiple group
>>> analysis. Right now, I have three groups, group 1 has the
>>> patients with the most severe state of disease A (grp1), group 2
>>> has the patients with less significant degree of disease A (grp2)
>>> and group 3 are unexposed controls (grp3). What is the best
>>> statistics if I want to see the differences among the three
>>> groups? i.e., if grp1 and grp2 are significant different from
>>> grp3 and if there is difference between grp1 and grp2.
>>>
>>> I am using one-way ANOVA to find out if there is any difference
>>> among three groups and then use multiple comparison to pick out
>>> which group is different. But I was also suggested that two sample
>>> t tests between each group might be a better choice.
>>>
>>> Your help is greatly appreciated.
>>>
>>> Longchuan
>>>
>>
>>
>> ---------------------------------------------------------------------------
>> Stephen M. Smith, Professor of Biomedical Engineering
>> Associate Director, Oxford University FMRIB Centre
>>
>> FMRIB, JR Hospital, Headington, Oxford OX3 9DU, UK
>> +44 (0) 1865 222726 (fax 222717)
>> [log in to unmask] http://www.fmrib.ox.ac.uk/~steve
>> ---------------------------------------------------------------------------
>>
>>
>
---------------------------------------------------------------------------
Stephen M. Smith, Professor of Biomedical Engineering
Associate Director, Oxford University FMRIB Centre
FMRIB, JR Hospital, Headington, Oxford OX3 9DU, UK
+44 (0) 1865 222726 (fax 222717)
[log in to unmask] http://www.fmrib.ox.ac.uk/~steve
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