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Dear Douglas,
I performed the statistical analysis using stats files so I do not have vertex information, I assume it will be cortical regions information. Is the approach to read them the same? Thank you, Laura
El 11 dic 2018, a las 16:54, Greve, Douglas N.,Ph.D. DGREVE@mgh.harvard.edu escribió:
The gamma and gammavar files are vertex-wise values. You can load them in matlab with something like g = MRIread('gamma.mgh'); gv = MRIread('gammavar.mgz'); but you will need the vertex that you are interested in (or do for all vertices). You can use fast_glm_power.m in the FSFAST toolbox to compute the power (requires stats toolbox).
On 12/11/18 6:39 AM, Laura Ferrero wrote:
External Email - Use CautionHi, I want to perform a power analysis and I read that I need 3 of 4 things:
- Effect size (mean/std)
- False positive rate
- Number of subjects
- True positive rate
I also read that the effect size can be calculated using gamma.mgh and gammavar.mgh files but I do not know how to open them in order to get the numbers.
Thank you, Laura
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