Hi,
see the randomise help page on the FMRIB web pages for an explanation on what the number of permutations ("n") is all about.
http://www.fmrib.ox.ac.uk/fsl/randomise/index.html
Basically, it is the precision you determine your p-value with that increases with n. 5000 is actually the lower limit, 10000 are "better".
Cheers,
Cornelius
Am 06.12.2010 um 23:32 schrieb Nicoḷ Cardobi:
> Good Morning again...
>
> Finally, I've been running correctly dual_regression script. Thanks a lot!
>
> A small advice... how much permutation do you suggest in order to get a proper result?
>
> In the Filippi paper (on the APOE carrier etc.) i see 5000 permutation. That takes a lot of time, but if it's necessary, there is no problem.
>
> Thank you!
>
> Best Regards
>
> Nicoḷ
