Poulsen: The checklist approach 问卷法与后面说的时间序列法什么关系，问卷法与时间序列有什么结合？

NO.PZ202206070100000501 问题如下 Regarng the approaches to economic forecasting, the statement whianalyst is most accurate? A.Poulsen B.Tuo C.Spenser SolutionC is correct. Spenser’s statement is most accurate. In the economic incators approach, for example, the composite of leang economic incators is baseon analysis of its forecasting usefulness in past cycles. The incators are intuitive, simple to construct, require only a limitenumber of variables, anthirparty versions are also available.A is incorrect. Contrary to Poulson’s statement, the checklist approais highly subjective antime-consuming.B is incorrect. Contrary to Tuoc’s statement, the relationships between variables are likely to change. In practice, mol-baseforecasts rarely forecast recessions well, although they have a better recorof anticipating upturns.C是正确的。Spenser的说法最准确。例如，在经济指标方法中，composite of leang economic incators是根据对其在过去周期中预测有用性的分析。该指标直观，易于构建，只需要有限的变量，并且容易从第三方获取数据。 A是不正确的。与Poulson的说法相反，checklist方法是一种高度主观的方法，而且很耗时。B是不正确的。与Tuoc的说法相反，变量之间的关系很可能会改变。在实践中，基于模型的预测尽管在预测经济好转方面有不错的记录，但是它们却很少能准确预测衰退。 请问econometric moling是robust的么？