文档介绍：C H A P T E R 1 I N TRO D U CTION 1 C h a p t e r 1 I n tro d u c ti on 1 . 1 W h a t i s e c o n om etr ics? • A p pl i c a t io n of s tatistical and m ath e matical methods to the analy sis of economic data. • P u r poses 1. T esting economic theories 2 . Policy analysis ( simultaneous eq uations model, v ector autoregressive model) 3 . F orecasting • H istory S ee M ary Morgan’ s (19 90 ) “ The History of E conometric I deas”(C amb ridge U niv. Press) E conometric mod el • Consists of several equations derived from economic theory and rea soning E x a m p l e 1 C o n s u m p t i on f unc tion c t = α+ β Y t + γ r t + ε t c t : a g gr e gate consumption ob serv ed at period t Y t : total e observed at period t r t : interest rate observed at period t u t : error term T ools f or econometrics • Econ