Hi Matthew,
sorry but I am confused ( I am not a stats person and the lingo sometimes is a bit overwhelming).
The help on "Randomize v2.1" clearly states the one-sample t-test: One sample t-test on difference measures!
Furthermore in the FEAT-manual (nearly at the end before the design matrices are displayed):
Singe group average (One Sample T-test):
"We have 8 subjects all in one group and want the mean group effect. DOES THE GROUP ACTIVATE ON AVERAGE?"
If we just test if the mean is different from Zero we won't get an information on "activation". In a BOLD
experiment the signal mean is always >0 (basically for any normal MR-data the mean is always >0 because we are
working with modulus images - even regions of "pure" noise have a mean >0!.
So how does this test evaluate activation pattern in a single group?
sorry if I appear stubborn but I would really like to understand the meaning for the randomize one-sample
t-test!
Cheers,
Boogie
|