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MathGroup Archive 2004

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Re: please solve

  • To: mathgroup at smc.vnet.net
  • Subject: [mg52934] Re: [mg52915] please solve
  • From: DrBob <drbob at bigfoot.com>
  • Date: Fri, 17 Dec 2004 05:18:59 -0500 (EST)
  • References: <200412160841.DAA27384@smc.vnet.net>
  • Reply-to: drbob at bigfoot.com
  • Sender: owner-wri-mathgroup at wolfram.com

The Inverse of that matrix doesn't exist, of course. If it did, this would work:

b = Inverse[Transpose[x] . x] . Transpose[x] . y

Bobby

On Thu, 16 Dec 2004 03:41:58 -0500 (EST), <rcmcll at yahoo.com> wrote:

> Greetings:
>
> Could someone please solve this symbolically?
> This is just the ols formula for beta-hat but I need a symbolic
> solution for this special case.
>
> b = inv(x'x)x'y
>
> where
>
> x =  1  t  t^2
> 1  t  t^2
> 1  t  t^2
>
>
> and simplify simplify simplify!!
>
> Thanks,
>
> Bob
>
>
>
>



-- 
DrBob at bigfoot.com
www.eclecticdreams.net


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