Understanding statistical analysis in PET paper

TonyJeffs tonyjeffs at aol.com
Sat Feb 28 03:51:06 EST 2004


Hi 
I'm looking for a simple overview of stats, something that won't give
me the formulas, but will give me a sense of what they're about

I'd like to get a very basic understanding of the stats in a paper I'm
reading.
(Its an attempt to prove that hypnosis is a real condition, using pet.
...& I think its pretty poor)

Here's some
left Fusiform  x-34 y -72 z -12  zScore 3.69

I get that the first three are spatial coordinates, but what's a
zScore?

Then there's 
F=8.69 dF=1,7 p=.02

I understand that p= in >= 2% of cases the result is likely to be
true,
but what's F & dF


Then theres
SD=3.9
I guess that's standard deviation?

And 
T=1.6
OK that's a T test.
So what does a T test tell me?


Is there maybe  a simple web page that describes this?

..........................
The paper is
"Hypnotic visual illusion alters color processing in the brain
Kosslyn
Thompson et al

Thanks

Tony



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