Scatter [xy] graph with 3rd dimension represented as size of marker

[Mark Webb-5]

I have performance rating for various attributes for 2 brands as well as
the derived importance of the attributes.
I want to make an xy graph of the 2 brands performance ratings but I
want the marker to change size to indicate how important the attribute is.
I have seen such graphs.

Is it possible in SPSS [V 17] ?
If not - what software does this ?

--
Mark Webb

[phone]
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Skype - webbmark
[hidden email]

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[ViAnn Beadle]

Yes, it is possible using GPL and there might even be an example in the help
GPL. Here's a really simple example:

GGRAPH
  /GRAPHDATASET NAME="graphdataset" VARIABLES=gdp_cap babymort populatn
MISSING=LISTWISE REPORTMISSING=NO
  /GRAPHSPEC SOURCE=INLINE.
BEGIN GPL
  SOURCE: s=userSource(id("graphdataset"))
  DATA: gdp_cap=col(source(s), name("gdp_cap"))
  DATA: babymort=col(source(s), name("babymort"))
  DATA: populatn=col(source(s), name("populatn"))
  GUIDE: axis(dim(1), label("Gross domestic product / capita"))
  GUIDE: axis(dim(2), label("Infant mortality (deaths per 1000 live
births)"))
  GUIDE: legend(aesthetic(aesthetic.color), label("Population in
Thousands"))
  SCALE: linear(aesthetic(aesthetic.size), aestheticMinimum(size."2px"),
              aestheticMaximum(size."15px"))
  ELEMENT: point(position(gdp_cap*babymort),
size(populatn),color(color.black),
  transparency(transparency.".5") )
END GPL.

Things to note:
1. the size(populatn) argument sets the size of the symbol.
2. By default, only color.exterior is set for the symbol. I've made it solid
here by using color which sets both fill and border for polygons.
3. Because the fill is solid, you run the risk of larger symbols obscuring
smaller ones. The transparency function lets the smaller ones bleed through.
4. The SCALE statement makes sure that the smallest symbol size is 2px and
the largest is 15px. This is really important because by default you get
teensy-weensy (that's a technical term) symbols.
5. The GUIDE statement provides a title for the legend to indicate what is
controlling the size of the symbols.

-----Original Message-----
From: SPSSX(r) Discussion [mailto:[hidden email]] On Behalf Of
Mark Webb
Sent: Thursday, August 27, 2009 8:17 AM
To: [hidden email]
Subject: Scatter [xy] graph with 3rd dimension represented as size of marker

I have performance rating for various attributes for 2 brands as well as
the derived importance of the attributes.
I want to make an xy graph of the 2 brands performance ratings but I
want the marker to change size to indicate how important the attribute is.
I have seen such graphs.

Is it possible in SPSS [V 17] ?
If not - what software does this ?

--
Mark Webb

[phone]
[phone]
Skype - webbmark
[hidden email]

=====================
To manage your subscription to SPSSX-L, send a message to
[hidden email] (not to SPSSX-L), with no body text except the
command. To leave the list, send the command
SIGNOFF SPSSX-L
For a list of commands to manage subscriptions, send the command
INFO REFCARD

=====================
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[hidden email] (not to SPSSX-L), with no body text except the
command. To leave the list, send the command
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