¥Statistical
Testing with AFNI
HParametric
Tests:
åAssume
data are normally distributed (Gaussian)
í3dttest (paired, unpaired)
í3dANOVA (or 3dANOVA2 or 3dANOVA3)
í3dRegAna (regression, unbalanced
ANOVA, ANCOVA)
íMatlab
script for one- up to four-way ANOVA (still under development)
HNon-parametric
analyses:
åNo
assumption of normality
åTends
to be less sensitive to outliers (more robust)
í3dWilcoxon (~t-test
paired)
í3dMannWhitney (~t-test
unpaired)
í3dKruskalWallis (~3dANOVA)
í3dFriedman (~3dANOVA2)
íPermutation
test
åLess
sensitive than parametric tests
åIn
practice, seems to make little difference
íProbably
because number of datasets is usually small