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Suppose for a sample with n independent observations the... Suppose for a sample with n independent observations the modelyi=0+1x1i+2x2i+ i, is considered, whereiare independent and
Suppose for a sample with n independent observations the...
Suppose for a sample with n independent observations the modelyi=0+1x1i+2x2i+ i, is considered, whereiare independent and identically distributed fromN(0,2). Additionally, the predictor variables are uncorrelated so that the following conditions are satisfied:
i=1n x1i=0, i=1nx2i=0, i=1nx1ix2i=0
Answer the each of the following questions for the case described above:
- Write the model in matrix form:y=X+.Specify the elements in each cell ofy,X,,and
- Calculate X'X and its inverse (X'X)-1.
- Calculateb, the least squares estimate of.
- Calculate SSreg(x1, x2)
- Provide the equations for SSreg(x1) and SSreg(x2) which correspond to the two simple linear regression models of y vs. x1and y vs. x2.
- Compare SSreg(x1, x2) from part d. and SSreg (x1) + SSreg (x2) from part e. Provide an explanation for this relationship.
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