In successful data-mining applications, this cooperation does not stop within initial phase. In practice, it always means an in-depth interaction between data-mining expert and application expert. The primary step requires combined expertise of an application domain and a data-mining model. There could also be several hypotheses formulated for one problem at this stage. In this step, a modeler usually specifies a group of variables for unknown dependency and, if possible, a general sort of this dependency as an initial hypothesis.
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