老师你好， 在2.1Penalized Regression中提到 要求LASSO最小，那不是什么都不加么？ 因为OLS已经是最小的了，多加一个feature都会使LASSO增大。 另外如果把“入”设成10000，但B3和B4都只有0.0001，那最后加一起LASSO也很小，所以最后X3 X4是加上去还是不加上去啊？ LASSO是减少features，可是为什么听视频的意思，只要X的系数足够小，都可以加呢？

“One would never exercise a call option if the price of the underlying is below the strike price.” 如果标的资产的价格正好低于执行价一点点，但是高于执行价-权利金，此时也应该执行吧。虽然执行会亏损，但是起码亏得比全部权利金要少吧？

z t 分布的区别和联系？t分布也是正态分布？

老师，请问书本467页第十一题答案，能否详细解释一下human capital公式是什么意思？各指代什么？

老师，请问书本466页第三题，A indemnity plan, B preferred provider plan, C health maintenance organization plan各自指什么意思？

老师，请问书本391页第十二题答案，From a tax perspective, the owner is taxed currently on the cash received and typically receives a tax deferral on the stock rolled over into the new entity. This strategy would be appealing to a business owner considering selling a private business in the near future and residing in a jurisdiction where tax rates are scheduled to increase这一段怎么理解？为什么会rolled over into the new entity? tax increase是什么情况？

老师，请问书本391页第十一题答案，There are two potential drawbacks with this strategy: The investor retains full downside exposure to the shares (to the extent the share price decreases by more than the premium received), and the upside potential is limited (the call strike price plus the premium received).第一点不太明白？股价下降不是既能保留股票又能赚取期权费，为什么会是缺点？第二点括号里的和limited有什么关系？这里是想表达什么意思？

Hidden Order的牺牲时间交易原则是适用于多久之内的？一个交易日之内？（我怎么知道什么时候又冒出来一个和我报价一样的order）

请教第八题。为何不选B？样本均值的标准误怎么是用总体标准差除以根号N?难道不是应该用样本标准差来除吗？

题目说的是cunrrent salary是25万，在56岁的时候salary不是应该25*（1+3%）吗？