Posted by
Art Kendall on
URL: http://spssx-discussion.165.s1.nabble.com/Dose-response-association-tp5740322p5740331.html
To begin, lose the extraneous decimals
FORMATS Activity (f3).
Do you have any other variables?
Age and gender are likely ones.
Start with scatter plots.
X= activity, Y = QoL.
Then in the output window, fit a straight line.
Then fit a loess line.
Eyeball the two lines.
Then scatterplot
X = activity Y = QoL Z = Age. Different shape markers for gender.
Different colors for some other categorical variable.
In the output window, rotate the 3D scatterplot to see different
perspectives.
At the minute I do not recall whether you can fit lines/planes for 3D
scatterplots. but the options will be there on the output window to see if
you can.
This beginning will give you some ideas on what regressions to try.
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Art Kendall
Social Research Consultants
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Art Kendall
Social Research Consultants