Dear Frank:
Thank you for your answer.
To do your suggestion, I need to get a contrast image for each subject
first. The problem is that each subject only run 3 sessions, it is not
sufficient to run a one-sample t test. So, how could I get a contrast image
for a subject run 3 sessions?
Sincerely
Ming-Ting
================================
Wu, Ming-Ting, M.D. Depart. of Radiology
Kaohsiung Veterans General Hospital, 813
Kaohsiung , Taiwan
Tel: 886-7-3422121 ext 6205, 6235
Fax: 886-7-3468301
Mobil: 0920-040-712
----- Original Message -----
±H¥óªÌ: Frank Jessen <[log in to unmask]>
¦¬¥óªÌ: Wu, Ming-Ting <[log in to unmask]>
¶Ç°e¤é´Á: 2000¦~10¤ë25¤é PM 02:01
¥D¦®: Re: multi-subject mult-session 2nd level
Dear Ming-Ting,
I would assume that entering 15 images of 5 subjects with 3 sessions each in
a
one-sample t-Test is not correct, because the three session of each subject
are
not independent. I think you need to model the three sessions on a single
subject basis and create one contrast image for each subject, resulting in
five
images for the t-test. This however is a very small number for a t-test,
where
you should have at least ten images. I think the best way would be to
include
at least ten subjects in your study and enter one contrast image per subject
in
your statistic.
Good luck
Frank
"Wu, Ming-Ting" wrote:
> Dear SPM group:
> I have a basic question which may have been addressed. Please be patient
to
> help anyway.
> we do fMRI study on 5 subjects, each has three sessions, each session
> generate a contrast image, so there are 15 contrast images.
> To do one sample t test, how should I input the 15 images? is there a way
to
> differentiate my setting from 15 subjects, each have one session?
>
> Sincerely
>
> Ming-Ting
>
> ================================
> Wu, Ming-Ting, M.D. Depart. of Radiology
> Kaohsiung Veterans General Hospital, 813
> Kaohsiung , Taiwan
> Tel: 886-7-3422121 ext 6205, 6235
> Fax: 886-7-3468301
> Mobil: 0920-040-712
--
Dr. med Frank Jessen
Klinik für Psychiatrie und Psychotherapie
Universität Bonn
Sigmund-Freud-Str. 25
53105 Bonn
Tel: 0228-287-5743
Fax: 0228-287-6097
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