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Economic models versus econometric models, types of econometrics, methodology of econometrics, properties of econometrics, goals of econometrics, and Data. Objectives: At the end of the lecture, students should be able to: (i) explain the term econometrics using various examples; (ii) mention and explain the types of econometrics; (iii) explain the uses of econometrics; (iv) explain econometric models, explain its purpose and how they are formulated; and (v) discuss the process of econometrics methodology 1. Definition and scope of econometrics What is Econometrics? Simply stated conometrics means economic measurement. The “metric” part of the word signifies measurement and econometrics is concerned with the measuring of economic relationships. It is a social science in which the tools of economic theory, mathematics and statistical inference are applied to the analysis of economic phenomena (Arthur Goldberger). 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Economic theory makes statements or hypotheses that are mostly of qualitative nature. Example: Other things remaining constant (ceteris paribus) a reduction in the price of a commodity is expected to increase the quantity demanded. And Economic theory postulates an inverse relationship between price and quantity demanded of a commodity. But the theory does not provide numerical value as the measure of the relationship between the two. Here comes the task of the econometrician to provide the numerical value by which the quantity will go up or down as a result of changes in the price of the commodity. 2. Economic statistics is concerned with collecting, processing and presenting economic data (descriptive statistics). Example: collecting and refining data on national accounts, index numbers, employment, prices, etc. 3. Mathematical statistics and mathematical economics do provide much of the tools used in Econometrics. But Econometrics needs special methods to deal with economic data which are never experimental data. Examples: Errors of measurement, problem of multicollinearity, problem of serial correlation are only econometric problems and are not the concerns of mathematical statistics. Econometrics utilizes these data to estimate quantitative economic relationships and to test hypothesis about them. The Econometrician is called upon to develop special methods of analysis and deal with such kinds of Econometric problems. Economic models vs. Econometric models A model is any representation of an actual phenomenon such as an actual system or process. The real world system is represented by the model in order to explain it, to predict it, and to control it. Any model represents a compromise between reality and manageability. A given representation of real world system can be a model if it fulfills the following requirements. 3 (1) It must be a “reasonable” representation of the real world system and in that sense it should be realistic. (2) On the other hand it must be “manageable” in that it yields certain insights or conclusions. A good model is both realistic and manageable. A highly realistic but too complicated model is a “bad” model in the sense it is not manageable. A model that is highly manageable but so idealized that it is unrealistic not accounting for important components of the real world system, is a “bad” model too. In general to find the proper balance between realism and manageability is the essence of good Modeling. Thus a good model should, on the one hand, specify the interrelationship among the parts of a system in a way that is sufficiently detailed and explicit and, on the other hand, it should be sufficiently simplified and manageable to ensure that the model can be readily analyzed and conclusions can be reached concerning the real world. Economic models Any economic theory is an observation from the real world. For one reason, the immense complexity of the real world economy makes it impossible for us to understand all interrelationships at once. Another reason is that all the interrelationships are not equally important for the understanding of the economic phenomenon under study. The sensible procedure is therefore, to pick up the important factors and relationships relevant to our problem and to focus our attention on these alone. Such a deliberately simplified analytical framework is called an economic model. It is an organized set of relationships that describes the functioning of an economic entity under a set of simplifying assumptions. All economic reasoning is ultimately based on models. 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