lecture2 - Economics 202A 1. Check to see if books are...

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1 Economics 202A Lecture II Fall 2007 1. Check to see if books are available. 2. Check to see if reader is available. 3. Extra Reading lists, Data Assignments. 4. Bring Chalk. 5. Section this evening 6:10 - 8, 145 McCone Hall. 6. Next Tuesday&s extra class will be in 141 McCone Hall, from 6:10 - 7:30. There are five groups of people who are allowed to enroll. 1. Those who are already enrolled. Then new enrollments will be restricted to four categories: 2. Economics graduate students for whom this is a required course. 3. ARE students for whom this is a required course. 4. Undergraduate majors in economics who are ready to take this course and who have my explicit permission. 5. One or two people who were earlier granted a promise that they could enroll in the class. There will be no auditors. I really do apologize to those of you who would like to take the class but are not allowed to enroll. I feel really very bad about this. I simply do not have a choice here. Last Spring, the University initially assigned us a room that was utterly terrible and also with fewer seats than this one. Phil Walz had to put up a real fight to get this room. I do have a suggestion for you. I want you to try to tell the story of the readings or of the lecture in your own words. In seminars while the mathematics is being presented, that&s what I try to do. I try
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to tell a story about what lies behind it. You should try to do that for yourself: to have your own story of what is behind the mathematics. That allows you to do the manipulations on two levels: Formally, in terms of the mathematics; But also, informally, in terms of your story. This is a way of being an active, rather than a passive, participant in the material. What are we going to do today? Max will give a further review this evening in 145 McCone Hall. And then next Tuesday±s class will be from 6:10 to 7:30 in 141 McCone Hall. Most of this lecture comes from what I learned in a Time Series course that I took in the statistics department taught by David Donaho, who has unfortunately left for Stanford. I will probably mention Dave again in the class on Sargent next Tuesday evening. The lecture will proceed in two parts. 1. I will review the solution to Difference Equations. I will review the solution to the first and second order linear difference equations. 2. I will give a short review of time series. I will discuss, at least briefly, ARMA models. These will be mathematical tools that will recur throughout the course. It is very important that you understand them from the beginning. So, you should definitely make it a first priority to read the sections of Harvey that are at the beginning of the Reader. Let me begin.
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lecture2 - Economics 202A 1. Check to see if books are...

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