It's definitely not the lack of dfs!
ATB,
Alexander
On 31 Mar 2011, at 13:37, Meera Paleja wrote:
> Thanks Claus- yes, I suspect it's likely because of reason a) that you stated.
>
> Meera
> ________________________________________
> From: SPM (Statistical Parametric Mapping) [[log in to unmask]] On Behalf Of Claus Lamm [[log in to unmask]]
> Sent: Thursday, March 31, 2011 1:31 PM
> To: [log in to unmask]
> Subject: Re: [SPM] "dalmation" pattern in data
>
> This reminds me of a pattern I got twice in the past, when
>
> a) not smoothing my data
> b) when analyzing data that had been preprocessed on a Linux system on
> Windows (or the other way round)
>
> Cheers,
> Claus
>
>
>
> -----Original Message-----
> From: SPM (Statistical Parametric Mapping) [mailto:[log in to unmask]] On
> Behalf Of Meera Paleja
> Sent: Donnerstag, 31. März 2011 19:20
> To: [log in to unmask]
> Subject: Re: [SPM] "dalmation" pattern in data
>
> Hi Alexander,
>
> I've attached the screenshot. This is what I'm seeing for single
> participants. I haven't done a group analysis yet since I only have 5 people
> in my sample so far. Does this effect normally disappear when I've done a
> 2nd level analysis?
>
> Meera
> ________________________________________
> From: Alexander Hammers [[log in to unmask]]
> Sent: Wednesday, March 30, 2011 4:50 PM
> To: Meera Paleja
> Cc: [log in to unmask]
> Subject: Re: [SPM] "dalmation" pattern in data
>
> Dear Meera,
>
>
> I may have missed the screenshot. What you describe sounds like what happens
> with very few degrees of freedom - unlikely to be a problem with fMRI, but
> how many did you have?
>
> ATB,
>
> Alexander
>
>
> -----------------------------
> Alexander Hammers, MD PhD
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