You have answered your own question. You indicate that
your dependent variable is an item with 7 points, which
makes it discrete. Therefore, the plot of the residuals
versus the fitted values will show "bands."
Tony Babinec
[hidden email]
"Your experience is what you agree to attend to." William James
-----Original Message-----
From: SPSSX(r) Discussion [mailto:
[hidden email]] On Behalf Of
Rebecca Stewart
Sent: Tuesday, June 16, 2009 7:39 AM
To:
[hidden email]
Subject: Scatterplot Problems: Residual over Precited
Dear List,
Apologies for the remedial question. I am trying to look at some data
to see if it is appropriate for regression. All I want is a simple plot
of residuals over predicted, hoping that I'll see nothing interesting
(instead of say, a fan). However, when I plot this, I get a graph I've
never seen.
The graph I get is not the scatterplots I'm used to seeing but these 7
negatively sloped lines. My DV was a scale with 7 points (don't know if
that's related) but I'm wondering what this means and why I'm getting
this and most importantly, WHAT is this? Any advice or feedback on what
I am doing wrong or what this graph is indicating (if correct) would be
hugely appreciated. Maybe I am not picking the right sort of resids or
preds in the dropdown menus.
I've pasted the syntax and graph below.
Any help would be appreciated.
Thanks!
Becca
REGRESSION
/MISSING LISTWISE
/STATISTICS COEFF OUTS R ANOVA
/CRITERIA=PIN(.05) POUT(.10)
/NOORIGIN
/DEPENDENT minbar
/METHOD=ENTER wrkshp age avhrwk rsrtrn2 dub1 dub2 dub3 dub4 dub5
/SCATTERPLOT=(*ZRESID ,*ZPRED)
/RESIDUALS NORM(ZRESID) OUTLIERS (SDRESID)
/CASEWISE=ALL SDBETA
/SAVE SDBETA.
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