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- Path: sparky!uunet!munnari.oz.au!bunyip.cc.uq.oz.au!topaz.ucq.edu.au!bakera
- From: bakera@topaz.ucq.edu.au (Alan Baker)
- Newsgroups: sci.math
- Subject: Re: Help required Regression
- Message-ID: <1992Sep13.211255.12360@topaz.ucq.edu.au>
- Date: 13 Sep 92 21:12:55 AET
- Organization: University of Central Queensland, Australia
- Lines: 29
-
- First of all let me appologise if this is the wrong news group to post
- this message. I am an Accountant by trade trying to treach myself some
- econometrics.
-
- I have a problem I have not been able to solve and would certainly
- appreciate some help.
-
- In the regression model
- y = X*B + e
- by writing
- y = x*B1 + Xs*Bs + e
- where x is a T-vector, B1 a scalar, Xs a T*(K-1) matrix and Bs is
- a (K-1) vector
-
- Using partitioned matrix inversion, how is the result
-
- var(b1) = sigma^2 / summation(x-xbar)^2(1-R^2) obtained
-
- Where R^2 is the coefficient of determinantion obtained by regressing
- x on Xs
-
- Any help at all would be much appreciated
-
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- Alan Baker AARNET: BAKER@COVAX.COMMERCE.UQ.OZ.AU
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