【跪求答案】2个计量学的题目（大恩不言谢）

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第一题
加入医疗保险的人(INSURANCE=1)和没有加入医疗保险的人(INSURANCE=0)
分析二者医疗费用支出的差异

where Y is a medical expenditure and X is a vector of other factors.问题（1）这个回归模型可以用OLS做吗？理由是什么？（2）回归模型中包含other factors(X)的理由是什么？另外other factors的选定标准是什么？

第二题

The following logit regression model is from Robinson and Min (2002), “Is the First to Market the First to Fail? Empirical Evidence for Industrial Goods Businesses," Journal of Marketing Research, Vol. 39, 120-128.

where Survive is a dummy variable set to 1 if the business survived for five (or ten) years after the Thomas Register's first listing, 0 otherwise; P a dummy for market pioneers; F a dummy for early followers; Lnlead the logarithmic value of the lead time; and X a vector of other factors for the survival.Write a null and alternative hypothesis which can answer the following questions, using the coefficients in the above model.

问题

(a) When pioneer lead time is held constant, do market pioneers have a greater chance than early followers of surviving?

(b) Dose increasing pioneer lead time increase the market pioneer's chance of surviving?

(c) What is the impact of delayed market entry on an early follower's chance of surviving? Is the relation linear or inverted-U shaped?

(The linear relation means that delayed market entry continuously decreases an early follower's chance of surviving. In constrast, the inverted-U relation indicates that delayed market entry initially increases an early follower's chance of survival, but any additional delay decreases the chance.)

(d) If  (linear), what do you expect about the sign of ?

If  (inverted U), what do you expect about the sign of ?

(e) Write the logit model using the estimates in Table 5.

(f) Based on the estimation results in Table 5, make a conclusion about the arguments in (a)~(c).

(Use a significance level of 10%.)

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关键词：计量学 求答案 significance coefficients coefficient

有人能给个答案吗？

第一题：
（1）若加入的变量X不是随机变量，不存在多重共线，就可以用OLS估计；
（2）应为因变量Y是医疗费用支出，不仅仅跟是否加入医疗保险有关，还应该有其它重要的影响因素。只考虑是否加入医疗保险，会遗漏重要解释变量，模型没有实际意义，也不会很显著。选择X的原则就是从理论上分析哪些因素可能会较大程度的影响Y的变化。

Table 5？

celon 发表于 2013-12-15 14:17
第一题：
（1）若加入的变量X不是随机变量，不存在多重共线，就可以用OLS估计；
（2）应为因变量Y是医疗费 ...

多谢多谢，跪拜跪拜

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