Residual variance

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Hi should I use the following code to save the residual variance:

assuming sample 1 to 20

OLS Y X  / PREDICT=YPRED
GENR RES=(Y-YPRED)**2
GEN1 RVAR=(1/(20-1))*Sum(RES)

Maybe i am missing something..I did not get the residual variance.Please help.

asked Oct 28 '11

Jack gravatar image Jack
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updated Oct 28 '11

SHAZAMHelp gravatar image SHAZAMHelp 332 ● 1 ● 5 ● 16
http://econometrics.com/
GEN1 is the same as SAMPLE 1 1 and GENR so this will only make this calculation for the 1st observation. To make this work try. GENR RVAR=SUM(RES,20)/18 where 18 is N-K. This will match the output from LIST - SHAZAMHelp (Oct 28 '11)
Thank you. But N-K= 20-1=19. (no constant) - Jack (Oct 28 '11)
In the above a constant is automatically inserted. To exclude a constant use the NOCONSTANT option. - SHAZAMHelp (Oct 28 '11)

1 Answer:

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Try the LIST option which prints this for you.

eg. 

ols Y X / list

Further descriptions on these sorts of calculations are here:

http://shazam.econ.ubc.ca/student/hill/SHAZAM.pdf

link

posted Oct 28 '11

SHAZAMHelp gravatar image SHAZAMHelp 332 ● 1 ● 5 ● 16
http://econometrics.com/

updated Oct 28 '11

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Asked: Oct 28 '11

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