Date:         Wed, 16 Aug 2006 08:15:24 +0100
Reply-To:     kornbrot <d.e.kornbrot@herts.ac.uk>
Sender:       "SPSSX(r) Discussion" <SPSSX-L@LISTSERV.UGA.EDU>
From:         kornbrot <d.e.kornbrot@herts.ac.uk>
Subject:      Re: Plotting
Comments: To: Gene Maguin <emaguin@buffalo.edu>
In-Reply-To:  <001901c6c09d$0d29a7b0$2345cd80@ssw.buffalo.edu>
Content-Type: text/plain; charset="ISO-8859-1"

I do that a lot
Once you have saved the predicted values
Main tab
Graphs>Interactive>Scatter
Y-axis  = predicted
X-axis  = covariate
Colour [or line if its for publication & needs to be b&w]= factor variable
Options tab
top:    Choose regression as function
bottom: tick Œseparate lines; untick Œgroupš
NB these can be changed afterwards by double clicking on the grpah produced

100% agree with you that its ridiculous that you canšt get this in GLM
direct

Best
Diana


On 15/8/06 20:00, "Gene Maguin" <emaguin@buffalo.edu> wrote:

> All,
> 
> This is branching off type follow-up on my earlier question about how to get
> GLM to plot what I think the documentation says it should be able to do. I
> taken a different tack.
> 
> Predicted values can be saved from either GLM or the analysis can be recast
> as a regression and solved using the regression procedure and predictec
> values saved from there. However, how do I get a plot that shows the within
> group regression line for each group. Background: My model has a single
> between factor and one covariate. Thus what I want to see is a plot of
> covariate by DV for each value of my 'by' variable and all on a single plot
> so that I can see where lines cross. I think I have run through the options
> on spss but maybe not. Graph will do scatterplots but there is no provision
> for a by variable and no provision for showing a regression line. Igraph is
> basically the same but although a by variable can be specified, it produces
> panels. Useless to me.
> 
> Thanks, Gene Maguin
> 


Professor Diana Kornbrot
Evaluation Co-ordinator, Blended Learning Unit
University of Hertfordshire
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