[TI-M] Re: Statistics
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[TI-M] Re: Statistics
I thought that he wanted the method, not just to have the calc do it for you. But yes, those
regressions are on the calcs.
Jeffrey
--- raykornele <raykornele@iVillage.com> wrote:
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> <-----Original Message----->
> >
> >From: jeff
> >Sent: 5/22/2002 5:05:49 PM
> >To: ti-math@lists.ticalc.org
> >Subject: [TI-M] Re: Statistics
> >
> >
> >I learned a formula for linear regression in an engineering class
> freshman year of high school,
> >but seem to have forgotten it. It involved a long series of sums of
> x's, y's, and various squared
> >terms i think... Hmm... Here, I looked this up and think it's right:
> >For y=m*x+b: (using E instead of sigma for sum)
> > Ey * E(x^2) - Ex * E(xy)
> >m = ------------------------
> > n * E(x^2) - (Ex)^2
> >
> > n * E(xy) - Ex * Ey
> >b= -------------------
> > n * E(x^2) - (Ex)^2
> >
> >Those look familiar; I think they're right. Not going to check them. I
> got them from
> >mathworld.com. They don't seem to have any other regressions there. If
> anyone has ever hacked
> >into the calc OS, they'd probably be able to find the algorithms...but
> I don't really know much
> >about that...
> >
> >Jeffrey
> __________________________________________________
>
> Actually, if you go to STATS|MATH you will find linear, quadratic,
> cubic, quartic, logarithmic, power, and exponential regression.
>
>
>
> KrazyKyngeKorny
>
>
>
>
>
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