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andersonwinkler / PALM

PALM: Permutation Analysis of Linear Models
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[ENH] Add variance smoothing #17

Open nicholst opened 5 years ago

nicholst commented 5 years ago

I usually tell people PALM does everything randomise/SnPM does and so much more. But I just realised PALM lacks one feature common to those two tools: Variance smoothing. For low DF it really can be an amazing power boost.

Smoothing of the variance image requires re-normalisation of the kernel according to the mask but otherwise is pretty straightforward, but I'm not sure how you'd do it on the mesh.

andersonwinkler commented 5 years ago

Hi Tom, It can be done, yes. Let me think a bit the most efficient way... updates soon I hope... Thanks! Anderson

andersonwinkler commented 5 years ago

Hi Tom (@nicholst)

There is a problem with implementing it: it's easy enough for voxelwise data but for surfaces, it's less trivial and there's a number of algorithms available. It should be included, nonetheless...

Anderson

nicholst commented 5 years ago

Ahh... yes. Surface smoothing is not trivial.