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Question & Answer
Question
How can I add transition arrows between two variables into a scatter plot ?
Cause
When you are generating a scatter plot with variables that were computed from the same variable, they suffer a transition. In this case you would like to explicitly display the transition into the chart.
Answer
The plot has a measurement scale on the Y axis and you would like to see the difference between the initial value of the variable on the X axis and the value after various calculations applied to it. All these values are reported to the Y axis. The outcome will contain the small arrows and there will be one for every particular case in the .sav file.
In order to insert the small transition arrows into a scatter plot you need to run the syntax block from below. Please note that this solution only applies for variables that suffer a value transition.
GGRAPH
/GRAPHDATASET NAME="graphdataset" VARIABLES=variable1 scale1 variable2 scale2 MISSING=VARIABLEWISE REPORTMISSING=NO
/GRAPHSPEC SOURCE=INLINE.
BEGIN GPL
SOURCE: s=userSource(id("graphdataset"))
DATA: variable1=col(source(s), name("variable1"))
DATA: scale1=col(source(s), name("scale1"))
DATA: variable2=col(source(s), name("variable2"))
DATA: scale2=col(source(s), name("scale2"))
GUIDE: axis(dim(1), label("VARIABLE (years)"))
GUIDE: axis(dim(2), label("SCALE (units)"))
GUIDE: text.title(label("SCALE vs VARIABLE"))
SCALE: cat(aesthetic(aesthetic.color), map(("Scatter before transition", color.darkgrey),
("Scatter after transition", color.lightgrey)))
SCALE: linear(dim(2), include(0))
ELEMENT: point(position(variable1*scale1), color("Scatter before transition"), color.exterior(color.darkgrey))
ELEMENT: point(position(variable2*scale2), color("Scatter after transition"), color.exterior(color.lightgrey))
ELEMENT: edge(position(link.join(variable1*scale1 + variable2*scale2)), shape(shape.arrow))
ELEMENT: line(position(smooth.linear(variable1*scale1)), shape.interior(shape.dash))
ELEMENT: line(position(smooth.linear(variable2*scale2)), shape.interior(shape.line))
END GPL.
An example of this solution is approached in the attached files.
You will find there the data file (*.sav), the syntax file (*.sps) and the output file (*.spv).
Related Information
Data for scatterplot with linked points.sav
Scatter with linked points.sps
Scatter with linked points.spv
[{"Product":{"code":"SSLVMB","label":"IBM SPSS Statistics"},"Business Unit":{"code":"BU059","label":"IBM Software w\/o TPS"},"Component":"Statistics Desktop","Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"19.0;20.0;21.0;22.0;23.0","Edition":"","Line of Business":{"code":"LOB10","label":"Data and AI"}},{"Product":{"code":"SSLVMB","label":"IBM SPSS Statistics"},"Business Unit":{"code":"BU059","label":"IBM Software w\/o TPS"},"Component":" ","Platform":[{"code":"","label":""}],"Version":"","Edition":"","Line of Business":{"code":"LOB10","label":"Data and AI"}}]
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Document Information
More support for:
IBM SPSS Statistics
Software version:
19.0, 20.0, 21.0, 22.0, 23.0
Document number:
263851
Modified date:
16 April 2020
UID
swg21902534
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