Assessing Statistical Studies/Econometric/Regression w.r.t  Internal and External Validity
Channel: Zahid Asghar
Date: 02/11/2020

Assessing Validity of Regression/Econometric Model
Ch.9 from Stock and Watson of Introduction to Econometrics. 
 Internal validity:  the statistical inferences about causal effects are valid for the population being studied.

 External validity:  the statistical inferences can be generalized from the population and setting studied to other populations and settings, where the “setting” refers to the legal, policy, and physical environment and related salient features.