Statement 1 An increase in the PVDBO will result in an actuarial loss for the company. Statement 2 The PVDBO measures the present value of future benefits earned by plan participants and includes plan assets. Statement 3 The company should use the expected long-term rate of return on plan assets as the discount rate to calculate the PVDBO.,老师statement1逻辑不是反了吗，应该是精算假设改变导致PBO增长吧

这三条听不懂老师说的，能简单解释下吗

在AR（1）模型中协方差平稳和序列相关是什么关系

老师，答案中算出自相关的标准误=0.0962后，为什么就说t-stastistic for each lag在0.01显著水平上就是显著的呢？还有为什么各lag下的标准差都是0.0962呢

esidual 序列相关、单位根、协方差平稳、协整几者之间是什么关系

为什么Initialoutlay会和NWCInv相关？FCInv是固定资产投入这个能理解，就是不理解为什么初期投资会和净营运资本有关系。

为什么zero coupon bond的风险敞口越早期越小呢？是因为货币的时间价值吗？ 比如B1到第五期回归面值，但因为是zero coupon，所以是折价发行的，在4时间点以前不值100块钱.

gaap下商誉减值依然不够的话要分配到non-cash吗

“If an omitted variable is correlated with variables already included in the model, coefficient estimates will be biased and inconsistent and standard errors will also be inconsistent.“课后题22的statement我看有些老师解释的是”如果遗漏了重要变量的话，那么误差项就会包含那个自变量的相关信息，因为原本属于那个遗漏变量的解释力度现在被夹杂到误差中了，那么误差项就会与自变量相关“说误差与自变量相关是说的和遗漏的自变量相关吧，这个statement说的可是与已经在模型里的自变量相关，这不是一个意思吧？

Stafford is a portfolio manager for a specialized real estate mutual fund. Her firm clearly describes in the fund's prospectus its soft dollar policies. Stafford decides that entering the CFA Program will enhance her investment decision- making skill and decides to use the fund's soft dollar account to pay the regis- tration and exam fees for the CFA Program. Which of the following statements is most likely correct? A. Stafford did not violate the Code and Standards because the prospectus informed investors of the fund's soft dollar policies. B. Stafford violated the Code and Standards because improving her investment skills is not a reasonable use of the soft dollar account. C. Stafford violated the Code and Standards because the CFA Program does not meet the definition of research allowed to be purchased with brokerage commissions. 老师，请问B为什么不对，感觉B比C更宽泛一些，C局限了软美元的用法在研报上，可能除了研报还可以有其他直接用于客户的方法呢。B错在哪里呢？