region.confi.smooth.linear in GPL provides the confidence interval for the
linear function. Cubic and quadratic are also available. Here's GPL to
display points, linear regression, and confidence intervals using the
Employee data.sav sample file:
GGRAPH
/GRAPHDATASET NAME="graphdataset" VARIABLES=salbegin salary
MISSING=LISTWISE REPORTMISSING=NO
/GRAPHSPEC SOURCE=INLINE.
BEGIN GPL
SOURCE: s=userSource(id("graphdataset"))
DATA: salbegin=col(source(s), name("salbegin"))
DATA: salary=col(source(s), name("salary"))
GUIDE: axis(dim(1), label("Beginning Salary"))
GUIDE: axis(dim(2), label("Current Salary"))
ELEMENT: point(position(salbegin*salary))
ELEMENT: line(position(smooth.linear(salbegin*salary)))
ELEMENT: line(position(region.confi.smooth.linear(salbegin*salary)))
END GPL.
Go to Help>Base System>GPL Reference for more information on these
functions.
-----Original Message-----
From: SPSSX(r) Discussion [mailto:
[hidden email]] On Behalf Of
Joanne Tsai
Sent: Tuesday, April 15, 2008 8:17 AM
To:
[hidden email]
Subject: graph confidence interval
Hi, Dear co-listers:
I have a question regarding to graphs/charts in SPSS.
How could I draw the confidence interval along with the estimated
curves?
I currently have many points/observations in my data file, and I would
like to do a graph connecting all the estimated points, as well as the
upper bond and lower bond.
Thank you so much,
Joanne
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