Hi, I have been running analyses in qdec and glmfit and comparing the results. I am puzzled by the results of one analysis that compares two groups. When I loaded a table.dat file in qdec and selected the variables of interest, an fsgd file containing only those variables was generated in the analysis, no problem so far. The problem is that the contrast.mat file contains more "identifiers" than variables I selected.
The generated fsgd file looks something like this: Class a Class b Variables x Input subj1 a 1 Input subj2 b 4 Input subj3 a 2 Input subj4 b 1
and the generated contrast.mat file looks like this: 0 0 +1 -1
I thought that to generate a contrast for these two groups of the correlations between thickness and variable x I shouldn't the contrast.mat file that looks like this: +1 -1 1
Thanks for any insight, Cameron