题目内容
（请给出正确答案）
A.Is it still available
B.Is it still empty
C.Is it still free
D.Is it still blank
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更多“Li: Hello. I'm ringing about t…”相关的问题
-- Hello. I'd like to speak to Mr. Reynolds.
-- _____.
A. I'm sorry he's not in right now
B. No, you can't
C. Sorry, you can't
D. Ok, go on
— May I speak to Prof . Li please？
—（）.
A.There's no Prof. Li
B.I'm afraid you've got the wrong number
C.No, you can't
- May I introduce myself？ I'm Li Hua.
- _________
A.I'm Todd Smith. It's nice to meet you.
B.I'm Todd Smith. How old are you？
C.Thank you.
D.Oh, here is my card. You can have a look.
Li had something to tell the manager, Mr Smith, so he went to his place, entering the room and said:
A.You're not busy, I hope.
B.Got a minute？
C.I'm terribly sorry to trouble you, Mr Smith.
D.Can I have a word with you Mr Smith？
A．Dr. Tutiler's office.
B．This is Mary.
C．Welcome to Dr. Tutiler's office.
D．Thank you for calling.
本题利用MRO 2.RAW中的数据。
(i) 利用在工作的428个妇女的数据， 通过以exper、exper z、n wife inc、age、kids li 6和kids ge 6为解释变量的OLS来估计受教育的回报。报告educ的估计值及其标准误。
(ii)现在用赫克曼估计受教育的回报，其中所有外生变量都在第二阶段的回归中出现。换句话说，就是做log(wagc)对educ、exper、ecper2、m wife inc、age、kids lt6、kids ge 6和 的回归。将估计的教育回报及其标准误与第(i)部分的结果相比较。
(iii) 只用428个工作妇女的观测， 将对e chuc、exper、ec per2、mv if eic、age、kidslt6、kids ge 6回归。R2为多大？这如何有助于解释你在第(ii)部分得到的结果？(提示：考虑多重共线性。)
A.can
B.may
C.would
D.have to
A.Not until
B.the sad news
C.did I knew
D.was killed
