Hornbeck (2010) - Revision history

Ed at 23:14, 29 September 2020

2020-09-29T23:14:58Z

2020-09-29T17:23:09Z

2020-09-29T17:20:00Z

2020-09-29T17:06:19Z

2020-09-29T16:47:59Z

2012-05-16T18:19:41Z

How does the author rule out alternative hypotheses?

2012-05-16T05:42:40Z

What do the authors tests achieve?

2012-05-16T05:29:16Z

How does the author test the hypothesis?

2012-05-16T05:28:58Z

How does the author test the hypothesis?

2012-05-16T05:27:58Z

How does the author test the hypothesis?

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← Older revision		Revision as of 16:47, 29 September 2020
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	Return to [[BPP Field Exam Papers 2012]]		Return to [[BPP Field Exam Papers 2012]]
	==Empirical Questions: ==		==Empirical Questions: ==

← Older revision		Revision as of 18:19, 16 May 2012
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	=== How does the author rule out alternative hypotheses? ===		=== How does the author rule out alternative hypotheses? ===
		+	*Counties with less woodland tend to be further west, so there is concern that estimates could be measuring some push towards increased western development. Results are robust to control for distance west of StL.
		+	*There is also a worry that counties with different woodland levels may be suited to different crops, so changes in prices/technologies contribute to differential growth. Merge data with soil data and allow for differential quadratic growth trends.
		+	*Convergence? The author adds controls for 1870 level of outcome interacted with each decade to allow for differential growth.
		+	*Construction of Railroad lines my be endogenous and effect barbwire development. Add controls in country railroad track mileage.

← Older revision		Revision as of 05:42, 16 May 2012
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	=== What do the authors tests achieve?===		=== What do the authors tests achieve?===
		+	Findings include that from 1880 to 1890 and 1890 to 1900 counties with the least woodland made large relative gains in the improvement of farmland. By contrast, there were no substantial changes at low woodland areas before 1880 or after 1900 or in higher woodland areas from 1880-1900.

	===How could the tests be improved on? Strengths? Weaknesses?===		===How could the tests be improved on? Strengths? Weaknesses?===

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 * We are looking at low woodland areas vs high woodland areas.  The sample is county & decade.  We need the introduction of barbwire to be endogenous i.e. it can't be correlated with better crops in any way.
-* We use an IV as change in costs as an IV for change in protection.
+* We use change in costs as an IV for change in protection.
 === What do the authors tests achieve?===

← Older revision		Revision as of 05:28, 16 May 2012
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	* We are looking at low woodland areas vs high woodland areas. The sample is county & decade. We need the introduction of barbwire to be endogenous i.e. it can't be correlated with better crops in any way.		* We are looking at low woodland areas vs high woodland areas. The sample is county & decade. We need the introduction of barbwire to be endogenous i.e. it can't be correlated with better crops in any way.
		+
		+	* We use an IV as change in costs as an IV for change in protection.

	=== What do the authors tests achieve?===		=== What do the authors tests achieve?===

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 <math>Y_{ct}-Y_{c(t-1)}= \alpha_{st} + \beta_{1t}W_{c}+\beta_{2t}W_{c}^{2}+\beta_{3t}W_{c}^{3}+\beta_{4t}W_{c}^{4}+ \epsilon_{ct}</math>
 *the estimated <math>\beta</math> are allowed to vary in each decade and summarize how changes over each decade in county outcome Y vary by country woodland level W
 === What do the authors tests achieve?===