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# st: RE: Questions about matrix operations

 From "Nick Winter" To Subject st: RE: Questions about matrix operations Date Mon, 17 Jun 2002 15:43:02 -0400

```> -----Original Message-----
> From: Wolff [mailto:wolff@MAIL1.andrew.cmu.edu]
> Sent: Monday, June 17, 2002 3:37 PM
> To: statalist@hsphsun2.harvard.edu
> Subject: st: Questions about matrix operations
>
>
> Hey folks,
> I have a simple problem.  I have a regression with three variables.  I
> would like to create a new variable equal to the sum of the estimated
> coefficients times the variable values.  The coefficients are saved in
> the matrix e(b).  I would like to do something like newvar=e(b)'*[var1
> var2 var3].  Since e(b)' is 1X3 and the next matrix is 3X1, I
> thought it
> would generate a scalar.  Is there an easy way to accomplish this?
>
> Thanks,
> Eric

See the -matrix score- command (help matscore).

Note that [var1 var2 var3] matrix is 3xN, not 3x1, so this will generate
a variable, not a scalar.

Cheers,
Nick W.

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