Principles of EconometricsPreface v List of Examples xxi 1 An Introduction to Econometrics 1 1. 1 Why Study Econometrics? 1 1. 2 What Is Econometrics About? 2 1. 2. 1 Some Examples 3 1. 3 The Econometric Model 4 1. 3. 1 Causality and Prediction 5 1. 4 How Are Data Generated? 5 1. 4. 1 Experimental Data 6 1. 4. 2 Quasi Experimental Data 6 1. 4. 3 Nonexperimental Data 7 1. 5 Economic Data Types 7 1. 5. 1 Time Series Data 7 1. 5. 2 Cross Section Data 8 1. 5. 3 Panel or
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