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Introductory Econometrics: A Modern Approach 6th Edition by Jeffrey M Wooldridge
Edition 6ISBN: 130527010XIntroductory Econometrics: A Modern Approach 6th Edition by Jeffrey M Wooldridge
Edition 6ISBN: 130527010X(i) Using the data in INJURY.RAW for Kentucky, the estimated equation when afchnge is dropped from (13.12) is
![(i) Using the data in INJURY.RAW for Kentucky, the estimated equation when afchnge is dropped from (13.12) is Is it surprising that the estimate on the interaction is fairly close to that in (13.12)? Explain. (ii) When afchnge is included but highearn is dropped, the result is Why is the coefficient on the interaction term now so much larger than in (13.12)? [Hint: In equation (13.10), what is the assumption being made about the treatment and control groups if ?<span class=sub>1</span>= 0?]](https://d2lvgg3v3hfg70.cloudfront.net/SMCC2709/0590554c_af45_4c44_bc95_299500ebd0e2_SMCC2709_11.jpg)
Is it surprising that the estimate on the interaction is fairly close to that in (13.12)? Explain.
(ii) When afchnge is included but highearn is dropped, the result is
![(i) Using the data in INJURY.RAW for Kentucky, the estimated equation when afchnge is dropped from (13.12) is Is it surprising that the estimate on the interaction is fairly close to that in (13.12)? Explain. (ii) When afchnge is included but highearn is dropped, the result is Why is the coefficient on the interaction term now so much larger than in (13.12)? [Hint: In equation (13.10), what is the assumption being made about the treatment and control groups if ?<span class=sub>1</span>= 0?]](https://d2lvgg3v3hfg70.cloudfront.net/SMCC2709/ece854c6_4d3c_4bd4_acb2_fb4cbcbdd12a_SMCC2709_11.jpg)
Why is the coefficient on the interaction term now so much larger than in (13.12)? [Hint: In equation (13.10), what is the assumption being made about the treatment and control groups if ?1= 0?] ![(i) Using the data in INJURY.RAW for Kentucky, the estimated equation when afchnge is dropped from (13.12) is Is it surprising that the estimate on the interaction is fairly close to that in (13.12)? Explain. (ii) When afchnge is included but highearn is dropped, the result is Why is the coefficient on the interaction term now so much larger than in (13.12)? [Hint: In equation (13.10), what is the assumption being made about the treatment and control groups if ?<span class=sub>1</span>= 0?]](https://d2lvgg3v3hfg70.cloudfront.net/SMCC2709/58ccfaf0_1aba_48a5_993a_c310f6771c91_SMCC2709_11.jpg)
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Step 1 of 2
1. It is not surprising that the estimate on the interaction term is fairly close to the one. In 13.12 example of this textbook, the co-efficient of afchnge is .0077, which shows clearly that afchnge has almost no effect on log(durat) and also the t-statistic is too small. So, dropping of such variable in the above model had no impact on the interaction term.
Step 2 of 2
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