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help > Interpretation of Z-score sign according to the behavioral variable
Mar 31, 2020 01:03 PM | anzianom
Interpretation of Z-score sign according to the behavioral variable
Hello,
I am performing analyses of lesion masks with a single behavioral variable where higher positive scores mean worse performance. I don't have any voxel reaching the significance threshold but I see that the results files and a check of the z maps of my lesion voxels provide zscores both positive and negative.
Based on the software statistics:
Is any adjustement of my behavioral variable needed to account for the behavioral meaning (for ex. changes of the sign if higer scores mean worse performance)?
Based on the exemple you give on the tutorial page of the site I can assume that the software performs for each voxel a t-test between the mean of the beahvioral scores in the lesioned voxel vs the same in the spared voxel (lesioned - spared) and that I have to interprete the resulting zscore based on this.
Is this correct?
If it is correct, in my case lesions in voxels with positive zscore should worsen the performance and the opposite for negative zscores.
Is this kind of reasoning correct or does the software use different statistical logic?
I hope my doubts were clearly explained.
Thank you in advance for your help
Marco Anziano
I am performing analyses of lesion masks with a single behavioral variable where higher positive scores mean worse performance. I don't have any voxel reaching the significance threshold but I see that the results files and a check of the z maps of my lesion voxels provide zscores both positive and negative.
Based on the software statistics:
Is any adjustement of my behavioral variable needed to account for the behavioral meaning (for ex. changes of the sign if higer scores mean worse performance)?
Based on the exemple you give on the tutorial page of the site I can assume that the software performs for each voxel a t-test between the mean of the beahvioral scores in the lesioned voxel vs the same in the spared voxel (lesioned - spared) and that I have to interprete the resulting zscore based on this.
Is this correct?
If it is correct, in my case lesions in voxels with positive zscore should worsen the performance and the opposite for negative zscores.
Is this kind of reasoning correct or does the software use different statistical logic?
I hope my doubts were clearly explained.
Thank you in advance for your help
Marco Anziano
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Title | Author | Date |
---|---|---|
anzianom | Mar 31, 2020 | |
Isabelle Faillenot | Apr 6, 2020 | |