# Questions tagged [endogeneity]

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### Technology as an endogenous economic variable

Most of the economic literature on technical progress either treats it as an exogenous variable, often as a stochastic shocks or without specifying the origin of technological progress. On the other ...
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### Can missing data cause endogeneity problem?

I am a econometrics newbie. I would like to ask a question. In the standard Hausman Taylor model, we need to specify exogeneous/endogenous variables for estimation. See: https://kb.iu.edu/d/bcfo ...
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### When can I assume that a variable is exogenous?

I'm looking for the effect of nutritional coffee breaks on MBA performance, and I found that the change to a healthier catering increased the performance of MBA students. Additionally, I want to see ...
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### Instrumental variable analysis for non-linear endogenous variable

I have a model of the form $$y_i = ax_{1i} + bx_{1i}^2 + cx_{3i} + \varepsilon_i$$ Where $x_1$ is an endogenous variable. Would I need instruments for both $x_1$ and $x_1^2$ or do I only need to ...
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### Is it okay to combine two control variables into one in order to get a more precise estimate of the coefficient on the main explanatory variable?

I am studying a natural experiment that resulted in some cities randomly receiving different numbers of competitors in a certain sector. (Stores applied for licenses in a government-run lottery.) In ...
1 vote
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### What is the example of inaccurate impact due to endogeneity?

When learning about endogenous variable, I found an answer in a topic on StackExchange very direct: An Exogenous Variable is defined as a variable which is unaffected by other variables within an ...
1 vote
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### What does "endogeneity of the industry structure" means?

Dong,2019,page 899 documented that: We estimate Export Market Leniency Laws as the weighted average of the passage of leniency programs in all other countries, excluding the country in which the firm ...
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1 vote
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### Using dependent variable's and exogenous variables' lags as instruments in 2SLS

Suppose we have the following structural equations: $$y=\beta_0+\beta_1x+\beta_2z_z+\beta_3z_3+\epsilon,$$ where $x$ is the endogenous variable and $z_1,z_2$ are exogenous variables. In the literature,...
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### Intuition behind the Endogeneity Test (the Hausman Test)

Suppose we have the following simple regression model (time series framework)" $$y_1=\beta_0+\beta_1 y_2+\beta_2 z_1 +\beta_3 z_2 +u,$$ where $z_1$ and $z_2$ are exogenous and $y_2$ is either ...
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### is endogeneity a problem in the first-stage regression in a two-stage least square regression?

We have this model: $$D=\alpha_1+\gamma_1 Z + \epsilon_1$$ $$Y=\alpha_2+\gamma_2 D + \epsilon_2$$ Notations are as usual: Y is the outcome, D is the treatment, Z is the instrument Two conditions for ...
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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 ...
1 vote
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### Why do we treat demographic variables as being exogenous?

I I would like to ask about demographic variables. In general, we usually include those variables as independent variables when we run regressions such as wage equation or test score equation. What ...
1 vote
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### The rationale for using a lagged variable to address endogeneity arising from simultaneous causation?

when there is simultaneous causation between dependent and independent variables often in papers we see a lagged variable being used in place of contemporaneous variable. For example, Clemens, ...
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### If an endogenous explanatory variable is serially correlated does it mean that its lags are also endogenous?

in panel data when examining economic growth determinants lags are often used to account for endogeneity of explanatory variables. However if the explanatory variable is serially correlated, does it ...
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### Endogeneity problem with a dummy variable

I have a panel data model as following, $$Y_{it}=intercept +B_1X_{it}+B_2Q_{it}+error_{it}$$ where $i$ is for firm and $t$= time. $Y$= trade credit demand, $X$= inventory cycle, as inventory ...
1 vote
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### Justification for my Random Effects estimation

I need to defend my use of the Random Effects (RE) estimator in my economics project. I've been told in cross validated that the proper place for the question is here. The causal effect of the ...
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### Can all the regressors be endogenous in a given model?

I'm trying to estimate the following model: Labor demand=f(wages,lagged labor demand, GFCF, GDP, trade share, labor productivity, real exchange rate)... (1) Wages= f(labor demand,lagged wages, GFCF, ...
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### Confounding versus endogenous variables. What is their relative hierarchical position?

There are valuable resources on the lexicon of types of variables quickly accessible, such as here. However, some of these concepts appear side-by-side often enough to make them confusing. For ...
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### Does endogeneity matter when neither independent variable nor error term are correlated with dependent variable?

if the double arrows show that X and the error term are correlated, but that neither variable affects Y, is endogeneity a problem in this scenario? Why or why not?
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### Testing for Endogeneity

I apologize if this question is very basic. I have the following plain vanilla Instrumental Variable model. $Y=\alpha+X\beta+\varepsilon$ $X=\delta+Z\gamma+\eta$ \$\varepsilon\perp\eta,\quad Z\perp\...
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### Addressing endogenity in price elasticity and the Promotion Optimization Problem

I have data on purchases gross prices discounts (like coupons) net prices (i.e. gross price - discounts) number of leads (potential customers at any given time) conversion rates (# purchases / # ...
1 vote
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### 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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### Count panel models for endogenous regressors

I have a count variable as the dependent variable and several continuous regressors on the RHS. The dependent variable and some regressors are supposed to be endogenous to unobserved factors. I have a ...