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Date:         Wed, 21 Sep 2005 17:42:23 +0200
Reply-To:     Karl Koch <TheRanger@gmx.net>
Sender:       "SPSSX(r) Discussion" <SPSSX-L@LISTSERV.UGA.EDU>
From:         Karl Koch <TheRanger@gmx.net>
Subject:      Re: Regresssion Plot in SPSS
Comments: To: Deepak Jethwani <deepak.jethwani@gmail.com>
Content-Type: text/plain; charset="us-ascii"

Hello,

I have now the coefficients table that contains unstandardized coefficients and standardized coefficients. It looks like this:

---------------------------------------------------------------- Model Unstd. Coeff. Std. Coeff. t Sig. B Std. Error Beta ----------------------------------------------------------------- 1(Constant) 4.195 .070 58.971 .000 A -.779 .042 -.319 -18.278 .000 B -.028 .046 -.010 -.618 .534 C -1.635 .064 -.442 -25.354 .000 -----------------------------------------------------------------

Now, I have one question. In regression theory, the linear regression equation (for three IVs) is defined as:

Y = a + b1*X1 + b2*X2 + b3*X3 + e

where a is a constant (distance on the Y axis) and b1, b2, b3 the paramters and e the error variance (which is fixed but random).

Given the fact that I have only two paramters being significant, is this the correct equation?

Y = 4.195 - 0.319 * A - 0.442 * C + e

What would be e in this case? I have standard erros for each parameter...

Karl

> > Hi Karl, > I don't know whether this is the optimal way but the method I use has two > steps > 1) For the regression line use the code > > CURVEFIT /VARIABLES=dep_var WITH indep_var > > /CONSTANT > > /MODEL=LINEAR > > /PLOT FIT. > 2) For getting the regression equation use > > REGRESSION > > /MISSING LISTWISE > > /STATISTICS COEFF OUTS R ANOVA > > /CRITERIA=PIN(.05) POUT(.10) > > /NOORIGIN > > /DEPENDENT dep_var > > /METHOD=ENTER indep_var . > Hope this helps. > Deepak > > On 9/21/05, Karl Koch <TheRanger@gmx.net> wrote: > > > > Hi all, > > > > how can I draw a regression diagram with the independent variable on the > X > > axis and the dependent variable on the Y axis in a plot together with > the > > regression equation as a line ? > > > > Karl > > > > -- > > GMX DSL = Maximale Leistung zum minimalen Preis! > > 2000 MB nur 2,99, Flatrate ab 4,99 Euro/Monat: > > http://www.gmx.net/de/go/dsl > > >

-- Lust, ein paar Euro nebenbei zu verdienen? Ohne Kosten, ohne Risiko! Satte Provisionen für GMX Partner: http://www.gmx.net/de/go/partner


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