T Q1. (20%) Which of the following statements are right and which are wrong? 1. The value of a stock variable can only b

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T Q1 20 Which Of The Following Statements Are Right And Which Are Wrong 1 The Value Of A Stock Variable Can Only B 1 (135.26 KiB) Viewed 41 times

T Q1. (20%) Which of the following statements are right and which are wrong? 1. The value of a stock variable can only be changed, during a simulation, by its flow variables. R-W 2. An inflow cannot be negative. R - W 3. The behavior of a stock is described by a differential equation. R - W 4. If A→+B, both variables A and B were increasing until time t, and variable A starts to decrease at time t, then variable B may either start to decrease or keep on increasing but at a reduced rate of increase. R - W 5. If a potentially important variable is not reliably quantifiable, it should be omitted from a SD model. R - W 6. SD models are continuous models: a model with discrete functions cannot be called a SD model since it is not continuous. R - W 7. It is possible that the same real-world system element-for various levels of aggregation and time horizons of interest-is modeled as a constant, a stock, a flow, or an auxiliary. R-W 8. One should also test the sensitivity of SD models to changes in equations of soft variables, table functions, structures and boundaries. R - W 9. SD validation is really all about checking whether SD models provide the right output behaviors for the right reasons. R - W 10. If a SD model produces an output which almost exactly fits the historical data of the last50 years, , it is certainly safe to use that model to predict the outputs 20 years from today. R-W