Use the area.
doug
On Tue, 6 May 2008, Pierson, Ronald K wrote:
I apologize if this has been asked and answered before, but I wish to combine rostral and caudal middle frontal gyri for a summary measure. To find the average thickness of the entire region, will it be weighted by the surface area or by the number of vertices?
Avg_MidFront = ((CaudThick*NumVertsCaud) + (RostThick*NumVertsRost) / (NumVertsCaud + NumVertsRost))
Or
Avg_MidFront = ((CaudThick*SurfAreaCaud) + (RostThick*SurfAreaRost) / (SurfAreaCaud + SurfAreaRost))
Thanks,
Ronald Pierson
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