Reply-To: | | [log in to unmask][log in to unmask]> > > wrote: > >> > >> You'd still need the F-contrast even in that case. Post-hoc tests > >> would be the same as I stated. > >> There are some things in the Glascher document that should be updated. > >> It's been on my list for quite some time, but never at the top of the > >> list. > >> > >> Best Regards, Donald McLaren > >> ================= > >> D.G. McLaren, Ph.D. > >> Research Fellow, Department of Neurology, Massachusetts General Hospital > >> and > >> Harvard Medical School > >> Postdoctoral Research Fellow, GRECC, Bedford VA > >> Website: http://www.martinos.org/~mclaren > >> Office: (773) 406-2464 > >> ===================== > >> This e-mail contains CONFIDENTIAL INFORMATION which may contain > PROTECTED > >> HEALTHCARE INFORMATION and may also be LEGALLY PRIVILEGED and which is > >> intended only for the use of the individual or entity named above. If > the > >> reader of the e-mail is not the intended recipient or the employee or > >> agent > >> responsible for delivering it to the intended recipient, you are hereby > >> notified that you are in possession of confidential and privileged > >> information. Any unauthorized use, disclosure, copying or the taking of > >> any > >> action in reliance on the contents of this information is strictly > >> prohibited and may be unlawful. If you have received this e-mail > >> unintentionally, please immediately notify the sender via telephone at > >> (773) > >> 406-2464 or email. > >> > >> > >> On Wed, Jan 9, 2013 at 9:46 PM, Jun Wang <[log in to unmask]> wrote: > >> > Thanks,Donald. If my two factors are all within subject factor(3 time > >> > window > >> > and 2 task condition), then I can use the contrast [0 0 0 0 0 1 0 -1 > -1 > >> > 0 > >> > 1]. right ( I just followed the example from Glascher's paper). in > this > >> > case, how should I set the contrast for posthoc t test right. > basically, > >> > I > >> > want to know the task difference on different time window > >> > > >> > thanks > >> > Jun > >> > > >> > > >> > On Wed, Jan 9, 2013 at 8:14 PM, MCLAREN, Donald > >> > <[log in to unmask]> > >> > wrote: > >> >> > >> >> On Wed, Jan 9, 2013 at 9:08 PM, Jun Wang <[log in to unmask]> wrote: > >> >> > Dear spm experts, > >> >> > I have a question regarding to post hoc t test in spm. I have a > 2X3 > >> >> > (group > >> >> > by task ) repeated design and got significant interaction when I > used > >> >> > contrast [0 0 0 0 0 1 0 -1 -1 0 1]. > >> >> > >> >> >>>> The correct interaction contrast is an F-test. [0 0 0 0 0 1 -1 0 > >> >> >>>> -1 0 > >> >> >>>> 0; 0 0 0 0 0 0 1 -1 0 -1 1]. This will tell you if there is an > >> >> >>>> interaction > >> >> >>>> between the task effects and group. From this, you could test > for > >> >> >>>> pairwise > >>{0‡l; |