निम्नलिखित में से किसे आम तौर पर एक नियतात्मक (deterministic) गणितीय मॉडल का मुख्य संरचनात्मक घटक नहीं माना जाता है?

Which of the following is NOT a recommended step while analyzing and modeling a mathematical problem?

Which model is one in which every set of variable states is uniquely determined by parameters in the model and by sets of previous states of these variables, without any random elements?