In GMDH models, the Selection Criterion determines which candidates for survival actually become survivors to go on to the next layer. It is the “objective function” that determines how good the model is at any stage. The Selection Criterion is set automatically when you select Smart GMDH in the Training and Stop Training Criteria module. In Advanced GMDH, you may select different Selection Criteria. Refer to GMDH Advanced Training Criteria for details.