GPL: point size

[la volta statistics]

Hi All

I want to have the point size in a scatter plot proportional to the number
of cases representing a specific point. This is possible with the size
function [size(n)] in the ELEMENT statement (see syntax example below).
Since the points are rather small, I would like the sizes of the points
increased by, lets say, a factor of 10. Is that possible through syntax? I
tried multiplying n by ten without success.
Additionally I would like to have the second legend, the one that displays
the sizes of the points, removed or not showing. Is that also possibly be
done through syntax?
I am using SPSS 15.

Thanks,

Christian

* Syntax Example.
****************.
DATA LIST FREE /Subj (F8.0) Rv(F8.2) IC(F8.2).
BEGIN DATA
1 7.83 6.57
1 7.42 5.62
1 7.89 6.90
1 7.12 6.57
1 7.88 6.35
1 6.16 4.06
2 7.26 4.29
2 6.71 4.26
2 6.54 4.09
3 6.05 6.01
3 5.42 5.67
END DATA.

Compute Delta_RV_IC = RV - IC.
Compute Av_RV_IC = (RV + IC )/2.
Var LAbel       Delta_RV_IC     'Difference'
                /Av_RV_IC       'Average'.

AGGREGATE
  /OUTFILE=*
  MODE=ADDVARIABLES
  /BREAK=Subj
  /Delta_RV_IC_sd = SD(Delta_RV_IC)
  /Delta_RV_IC_Mean = MEan(Delta_RV_IC)
  /Av_RV_IC_mean = MEAN(Av_RV_IC)
  /n = N.

Var Label       Av_RV_IC_mean   'Average per patient'
                /Delta_RV_IC_Mean       'Mean difference per patient'.

* Compute n = n * 10.

GGRAPH
  /GRAPHDATASET NAME="graphdataset" VARIABLES=Av_RV_IC_mean
  Delta_RV_IC_Mean Subj n MISSING=LISTWISE REPORTMISSING=NO
  /GRAPHSPEC SOURCE=INLINE.
BEGIN GPL
 SOURCE: s=userSource(id("graphdataset"))
 DATA: Av_RV_IC_mean=col(source(s), name("Av_RV_IC_mean"))
 DATA: Delta_RV_IC_Mean=col(source(s), name("Delta_RV_IC_Mean"))
 DATA: Subj=col(source(s), name("Subj"), unit.category())
 DATA: n=col(source(s), name("n"), unit.category())
 GUIDE: axis(dim(1), label("Average per patient"))
 GUIDE: axis(dim(2), label("Mean difference per patient"))
 GUIDE: legend(aesthetic(aesthetic.color.exterior), label("Subject No"))
 SCALE: cat(aesthetic(aesthetic.color.exterior))
 ELEMENT: point(position(Av_RV_IC_mean*Delta_RV_IC_Mean),
color.exterior(Subj), size(n) )
END GPL.



*******************************
la volta statistics
Christian Schmidhauser, Dr.phil.II
Weinbergstrasse 108
CH-8006 Zürich
Tel: [phone]
Fax: [phone]
email: mailto:[hidden email]
internet: http://www.lavolta.ch/

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[ViAnn Beadle]

It's very hard to force an exact match on the point sizes but you can
specify the minimum threshold size using the aestheticMinimum function on
the SCALE statement controlling the aesthetic.

To remove an automatically created legend, use the null() function on the
GUIDE statement.

Here's an example:

* Chart Builder.
GGRAPH
  /GRAPHDATASET NAME="graphdataset" VARIABLES=engine mpg weight
MISSING=LISTWISE REPORTMISSING=NO
  /GRAPHSPEC SOURCE=INLINE.
BEGIN GPL
  SOURCE: s=userSource(id("graphdataset"))
  DATA: engine=col(source(s), name("engine"))
  DATA: mpg=col(source(s), name("mpg"))
  DATA: weight=col(source(s), name("weight"))
  GUIDE: axis(dim(1), label("Engine Displacement (cu. inches)"))
  GUIDE: axis(dim(2), label("Miles per Gallon"))
  SCALE: linear(aesthetic(aesthetic.size), aestheticMinimum(size."5px"))
  GUIDE: legend(aesthetic(aesthetic.size), null())
  ELEMENT: point(position(engine*mpg), size(weight), color(color.gray))
END GPL.


-----Original Message-----
From: SPSSX(r) Discussion [mailto:[hidden email]] On Behalf Of la
volta statistics
Sent: Thursday, August 21, 2008 3:00 AM
To: [hidden email]
Subject: GPL: point size

Hi All

I want to have the point size in a scatter plot proportional to the number
of cases representing a specific point. This is possible with the size
function [size(n)] in the ELEMENT statement (see syntax example below).
Since the points are rather small, I would like the sizes of the points
increased by, lets say, a factor of 10. Is that possible through syntax? I
tried multiplying n by ten without success.
Additionally I would like to have the second legend, the one that displays
the sizes of the points, removed or not showing. Is that also possibly be
done through syntax?
I am using SPSS 15.

Thanks,

Christian

* Syntax Example.
****************.
DATA LIST FREE /Subj (F8.0) Rv(F8.2) IC(F8.2).
BEGIN DATA
1 7.83 6.57
1 7.42 5.62
1 7.89 6.90
1 7.12 6.57
1 7.88 6.35
1 6.16 4.06
2 7.26 4.29
2 6.71 4.26
2 6.54 4.09
3 6.05 6.01
3 5.42 5.67
END DATA.

Compute Delta_RV_IC = RV - IC.
Compute Av_RV_IC = (RV + IC )/2.
Var LAbel       Delta_RV_IC     'Difference'
                /Av_RV_IC       'Average'.

AGGREGATE
  /OUTFILE=*
  MODE=ADDVARIABLES
  /BREAK=Subj
  /Delta_RV_IC_sd = SD(Delta_RV_IC)
  /Delta_RV_IC_Mean = MEan(Delta_RV_IC)
  /Av_RV_IC_mean = MEAN(Av_RV_IC)
  /n = N.

Var Label       Av_RV_IC_mean   'Average per patient'
                /Delta_RV_IC_Mean       'Mean difference per patient'.

* Compute n = n * 10.

GGRAPH
  /GRAPHDATASET NAME="graphdataset" VARIABLES=Av_RV_IC_mean
  Delta_RV_IC_Mean Subj n MISSING=LISTWISE REPORTMISSING=NO
  /GRAPHSPEC SOURCE=INLINE.
BEGIN GPL
 SOURCE: s=userSource(id("graphdataset"))
 DATA: Av_RV_IC_mean=col(source(s), name("Av_RV_IC_mean"))
 DATA: Delta_RV_IC_Mean=col(source(s), name("Delta_RV_IC_Mean"))
 DATA: Subj=col(source(s), name("Subj"), unit.category())
 DATA: n=col(source(s), name("n"), unit.category())
 GUIDE: axis(dim(1), label("Average per patient"))
 GUIDE: axis(dim(2), label("Mean difference per patient"))
 GUIDE: legend(aesthetic(aesthetic.color.exterior), label("Subject No"))
 SCALE: cat(aesthetic(aesthetic.color.exterior))
 ELEMENT: point(position(Av_RV_IC_mean*Delta_RV_IC_Mean),
color.exterior(Subj), size(n) )
END GPL.



*******************************
la volta statistics
Christian Schmidhauser, Dr.phil.II
Weinbergstrasse 108
CH-8006 Zürich
Tel: [phone]
Fax: [phone]
email: mailto:[hidden email]
internet: http://www.lavolta.ch/

=====================
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
SIGNOFF SPSSX-L
For a list of commands to manage subscriptions, send the command
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