10 questions linked to/from What is a 'true' model?
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### In regression analysis what's the difference between data-generation process and model?

In regression analysis what's the difference between 'data-generation process' and 'model'?
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### Regression and causality in econometrics

In regression in general and in linear regression in particular causal interpretation about parameters is sometimes permitted. At least in econometrics literature, but not only, when causal ...
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### How would econometricians answer the objections and recommendations raised by Chen and Pearl (2013)?

In their article, Chen and Pearl (2013), critically examined 6 econometric textbooks, among these the textbooks written by Wooldridge (2009) {the introductory book}, and Stock & Watson (2011). ...
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### Using LASSO to select model - can't infer, what does this mean?

I realize that when I use LASSO to select a model, I can't infer from it because it penalizes the coefficients to best fit the data. I'm just a little confused as to what exactly this means. Isn't ...
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### What's the DGP in causal inference?

This question come from this discussion (Under which assumptions a regression can be interpreted causally? ). That discussion touch too arguments and is not possible to speak about all things there. ...
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### Does homoscedasticity imply that the regressor variables and the errors are uncorrelated?

By OLS regression equation: $$Y = a + bX + e$$ My thoughts are that homoscedasticity by definition imply that $Var(Y|X) = Var(e|X)=$ constant, then this would imply that $Var(e|X) = Var(e)$ which ...
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### linear causal model

Currently I’m focused on linear causal model expressed as a structural equation like this: $y = \beta_1 x_1 + \beta_2 x_2 + … + \beta_k x_k + u$ where $E[u|x_1,x_2,…,x_k]=0$ (exogenous error) we ...
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### Structural equation and causal model in economics

Structural equations is a useful language for causal analysis in economics. In Causality Pearl (2009 cap 5) we can find the best discussion about this. My question: is possible to use the concept of ...