# Questions tagged [instrumental-variable]

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### Entropy Balancing or Propensity Score matching in an Experiment (that needed Intention to Treatment instrumental variable IV approach)

I did an experiment with random assignment to two treatment groups and one control group. I had problems to encourage participation in one treatment (treatment 1), so at the end, I had to randomly ...
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### Which one is IV estimator formula? (indirect least squares)

It's from the book mostly harmless econometrics. In page 120, we have 2 equations: $$s_i = X_i' \pi_{10} + \pi_{11} z_i + \epsilon_{1i}$$ $$Y_i = X_i' \pi_{20} + \pi_{21} z_i + \epsilon_{2i}$$ The ...
318 views

### Why are my 2SLS estimates much larger than my OLS estimates?

When performing IV regression, it is often taken as a sign of unbiasedness if the IV estimates are similar to the OLS estimates of the same model. My question is: If the estimates are very different,...
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### Weak Instrument - Stock and Yogo

I have the following structural equations where $G,Z$ are endogenous and $X,Y$ are exogenous $$G_d=B_0+B_1Z+B_2X+u_1\\ G_s=a_0 +a_1Z+a_2Y+u_2 \\ G_d=G_s$$ Now, I would like to perform 2SLS, thus, ...
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### Some confusions about instrumental variable (econometrics)

As the title says, I have some confusions about instrumental variable. According to my lecture note (which is supposed to be reliable), instrumental variable has two big properties: Validity: an ...
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### Over What Ranges Can Elasticity Estimates Be Applied

I am reading the following paper: https://onlinelibrary.wiley.com/doi/full/10.1111/1756-2171.12113 The paper attempts to estimate the elasticity of pharmaceutical innovation (measured by # of new ...
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### Testing for endogeneity when the model does not have any known exogenous variables?

so I was wondering how can one test for endogeneity in a model if the model does not have any known exogenous variables, there are no instruments available for the suspected endogenous variables? I ...
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### Is it reasonable, in panel data, to use past values of explanatory variables as instruments to deal with simultaneous causality?

I am trying to examine the determinants of economic growth, essentially regressing a number of variables upon economic growth. I face a problem that there is likely simultaneous causality between many ...
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### Testing for weak instrument

I have 3 endogenous variables in my model and I have identified 3 (or max 4) instruments. I wanted to know appropriate test for identifying whether the instruments are weak or not given that I have ...
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### Testing if one regressor is a proxy for another

I'm reading Guiso, Sapienza and Zingales: "Trusting the Stock Market" The Journal of Finance, Vol. 63, No. 6, 2008 and have a question about how they test whether trust is a proxy for risk aversion. ...
360 views

### How to test if variables are jointly determined?

If I wanted to test, for example, if consumption growth and credit growth are jointly determined, and therefore justifying the use of instrumental variables, how would I go about this? Would running a ...
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### What is the difference between two stage least squares and instrumental variable regression?

I'm doing independent study and I am having trouble understanding the difference between these two estimators. I get that 2SLS is predicting the endogenous variable, and that instrumental variables ...
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### IV：Quasi-random variance V.S. 'Placebo' check

I read some papers about transportation infrastructure. I am confuse with the following two case. Some routes are unlikely to have been randomly assigned across cities over time. Thus, In some papers(...
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### Trouble Deriving Indentification Scheme in Gertler-Karadi (2015) AEJ

I'm having trouble following a derivation that Gertler-Karadi (2015) AEJ http://pubs.aeaweb.org/doi/pdfplus/10.1257/mac.20130329 do in their paper on Footnote 4 on the bottom of page 52. I've tried ...
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### Using another person's guess as an IV

In Estimates of the Economic Return to Schooling from a New Sample of Twins by Orley Ashenfelter and Alan Krueger, they correct sampling error with an IV. They claim that their results imply a larger ...
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### How to justify an instrumental variable?

I am hoping for some tips on what I could do for a term paper in applied econometrics. We are running a 2sls where I want to use a firm's location as an IV. How can I go about justifying it is a valid ...
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### Which regression technique is used for calculating price elasticity in practice

Since we need to consider 'Endogeneity' between price and quantity while calculating price elasticity and since linear regression cannot handle the phenomenon of endogeneity if objective of the model ...
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### Using an interaction term as the instrument (as in Barro QJE (2011))

I recently came across Barro and Redlick QJE (2011) paper, "Macroeconomic Effects from Government Purchases and Taxes", in which the authors instrument for defense spending with an interaction term ...
I have three variables: $y$, $x_1$ and $z$. I'm interested in finding the effect of $x_1$ on $y$. Unfortunately $x_1$ is endogenous so I use an instrument z. I know that $z$ is correlated with $x_1$....