Hello, I am running qdec group analysis on my patient data. I am studying the differences between two Epilepsy onset types and have a few questions.
1) I select "subtype" as my discrete variable and "duration" as my continuous variable. In the display tab two questions appear. 1. Does the average thickness differ from zero? and 2. Does the average thickness differ between HYP and LVF (the two onset types)? What is the difference between these two questions? Mainly, can someone please explain question 1 and how that is calculated.
2) Are corrections for multiple comparisons already build into the qdec analysis? or is this something that needs to be run separately. Is permutation testing required to determine how likely the observed level of significant atrophy within each p-map would occur by chance?
Thank you in advance, Kristina