title: In the Orange data mining toolkit, how do I specify groups for cross-validation?
body: <p>I'm using the Orange GUI, and trying to perform cross-validation. My data has 8 different groups (specified by a variable in the input data), and I'd like each fold to hold out a different group. Is this possible to do using Orange? I can select the number of folds for cross-validation, but I don't see any way of determining which data is in each one.</p>