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GGRAPH: What does the SCALE statement do to the data

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GGRAPH: What does the SCALE statement do to the data

la volta statistics
Hi

Somehow I don't understand the SCALE statement in GGRAPH procedures.
I want to draw a line graph over 4 time points split by treatment A and B
(see syntax below).
That works ok as long as I don't use a SCALE statement for the scale
variable (Index1).
However, when I use
SCALE: linear(dim(2), min(0.0), max(8.0))
to specify a linear dimension scale between 0 to 8, the axis is correctly
limited
to the range 0 to 8 but the data points are now transformed and in a wrong
locations.
How would I limit the dim(2) to a certain range and keeping the values
correct?
And how do I have to understand the transformation 'SCALE: linear' is doing
to the variable trans1?

Thanks, Christian


*Example.

NEW FILE.
DATASET CLOSE all.

DATA LIST Free/id1(f8.0) Medi(f8.0) p01_pat(a5) Index1(f8.0) trans1(f8.2).
BEGIN DATA
1  2 A-001 1 3.00
1  2 A-001 2 1.00
1  2 A-001 3 2.00
1  2 A-001 4 .50
2  1 A-002 1 1.50
2  1 A-002 2 4.00
2  1 A-002 3 2.00
2  1 A-002 4 1.00
END DATA.

Var Label Medi 'Treatment'.
Val Lable Medi  1 "A"
                        2 "B".

* This first example works well but does not limit the range of dim(2).
GGRAPH
  /GRAPHDATASET NAME="graphdataset" VARIABLES = id1 Index1 trans1 Medi
P01_pat
   MISSING=LISTWISE REPORTMISSING=NO
  /GRAPHSPEC SOURCE=INLINE.
BEGIN GPL
PAGE: begin(scale(1200px,600px))
  SOURCE: s=userSource(id("graphdataset"))
  DATA: trans1  =col(source(s), name("trans1"), unit.category())
  DATA: Medi    =col(source(s), name("Medi"), unit.category())
  DATA: Index1  =col(source(s), name("Index1"), unit.category())
  DATA: id1     =col(source(s), name("id1"), unit.category())
  DATA: P01_pat =col(source(s), name("P01_pat"), unit.category())
  SCALE: cat(aesthetic(aesthetic.color.interior), map(("1",color.red),
("2",color.blue)))
  GUIDE: text.title(label("Chart xyz\nMeasurments by Treatment"))
  GUIDE: axis(dim(1), label("Time points"))
  GUIDE: axis(dim(2), label("Some Scale"))
  ELEMENT: line(position(Index1*trans1), split(id1), color(Medi))
  ELEMENT: point(position(Index1*trans1), split(id1), label(P01_pat),
color(Medi))
PAGE: end()
END GPL.

* This example limits the range of dim(2) fom 0 to 8 but transforms the
variable trans1.
GGRAPH
  /GRAPHDATASET NAME="graphdataset" VARIABLES = id1 Index1 trans1 Medi
P01_pat
   MISSING=LISTWISE REPORTMISSING=NO
  /GRAPHSPEC SOURCE=INLINE.
BEGIN GPL
PAGE: begin(scale(1200px,600px))
  SOURCE: s=userSource(id("graphdataset"))
  DATA: trans1  =col(source(s), name("trans1"), unit.category())
  DATA: Medi    =col(source(s), name("Medi"), unit.category())
  DATA: Index1  =col(source(s), name("Index1"), unit.category())
  DATA: id1     =col(source(s), name("id1"), unit.category())
  DATA: P01_pat =col(source(s), name("P01_pat"), unit.category())
  SCALE: cat(aesthetic(aesthetic.color.interior), map(("1",color.red),
("2",color.blue)))
  GUIDE: text.title(label("Chart xyz\nMeasurments by Treatment"))
  GUIDE: axis(dim(1), label("Time points"))
  GUIDE: axis(dim(2), label("Some Scale"))
  SCALE: linear(dim(2), min(0.0), max(8.0))
  ELEMENT: line(position(Index1*trans1), split(id1), color(Medi))
  ELEMENT: point(position(Index1*trans1), split(id1), label(P01_pat),
color(Medi))
PAGE: end()
END GPL.




*******************************
la volta statistics
Christian Schmidhauser, Dr.phil.II
Weinbergstrasse 108
Ch-8006 Zürich
Tel: +41 (043) 233 98 01
Fax: +41 (043) 233 98 02
email: mailto:[hidden email]
internet: http://www.lavolta.ch/
Peck, Jon
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Re: GGRAPH: What does the SCALE statement do to the data

Peck, Jon
Your SCALE statement specifies a linear scale while your trans1 variable placed on that axis is declared as categorical.  Just remove the unit.category() from the variable definition, and all will be well.

Regards,
Jon Peck

-----Original Message-----
From: SPSSX(r) Discussion [mailto:[hidden email]] On Behalf Of la volta statistics
Sent: Thursday, April 19, 2007 6:57 AM
To: [hidden email]
Subject: [SPSSX-L] GGRAPH: What does the SCALE statement do to the data

Hi

Somehow I don't understand the SCALE statement in GGRAPH procedures.
I want to draw a line graph over 4 time points split by treatment A and B
(see syntax below).
That works ok as long as I don't use a SCALE statement for the scale
variable (Index1).
However, when I use
SCALE: linear(dim(2), min(0.0), max(8.0))
to specify a linear dimension scale between 0 to 8, the axis is correctly
limited
to the range 0 to 8 but the data points are now transformed and in a wrong
locations.
How would I limit the dim(2) to a certain range and keeping the values
correct?
And how do I have to understand the transformation 'SCALE: linear' is doing
to the variable trans1?

Thanks, Christian


*Example.

NEW FILE.
DATASET CLOSE all.

DATA LIST Free/id1(f8.0) Medi(f8.0) p01_pat(a5) Index1(f8.0) trans1(f8.2).
BEGIN DATA
1  2 A-001 1 3.00
1  2 A-001 2 1.00
1  2 A-001 3 2.00
1  2 A-001 4 .50
2  1 A-002 1 1.50
2  1 A-002 2 4.00
2  1 A-002 3 2.00
2  1 A-002 4 1.00
END DATA.

Var Label Medi 'Treatment'.
Val Lable Medi  1 "A"
                        2 "B".

* This first example works well but does not limit the range of dim(2).
GGRAPH
  /GRAPHDATASET NAME="graphdataset" VARIABLES = id1 Index1 trans1 Medi
P01_pat
   MISSING=LISTWISE REPORTMISSING=NO
  /GRAPHSPEC SOURCE=INLINE.
BEGIN GPL
PAGE: begin(scale(1200px,600px))
  SOURCE: s=userSource(id("graphdataset"))
  DATA: trans1  =col(source(s), name("trans1"), unit.category())
  DATA: Medi    =col(source(s), name("Medi"), unit.category())
  DATA: Index1  =col(source(s), name("Index1"), unit.category())
  DATA: id1     =col(source(s), name("id1"), unit.category())
  DATA: P01_pat =col(source(s), name("P01_pat"), unit.category())
  SCALE: cat(aesthetic(aesthetic.color.interior), map(("1",color.red),
("2",color.blue)))
  GUIDE: text.title(label("Chart xyz\nMeasurments by Treatment"))
  GUIDE: axis(dim(1), label("Time points"))
  GUIDE: axis(dim(2), label("Some Scale"))
  ELEMENT: line(position(Index1*trans1), split(id1), color(Medi))
  ELEMENT: point(position(Index1*trans1), split(id1), label(P01_pat),
color(Medi))
PAGE: end()
END GPL.

* This example limits the range of dim(2) fom 0 to 8 but transforms the
variable trans1.
GGRAPH
  /GRAPHDATASET NAME="graphdataset" VARIABLES = id1 Index1 trans1 Medi
P01_pat
   MISSING=LISTWISE REPORTMISSING=NO
  /GRAPHSPEC SOURCE=INLINE.
BEGIN GPL
PAGE: begin(scale(1200px,600px))
  SOURCE: s=userSource(id("graphdataset"))
  DATA: trans1  =col(source(s), name("trans1"), unit.category())
  DATA: Medi    =col(source(s), name("Medi"), unit.category())
  DATA: Index1  =col(source(s), name("Index1"), unit.category())
  DATA: id1     =col(source(s), name("id1"), unit.category())
  DATA: P01_pat =col(source(s), name("P01_pat"), unit.category())
  SCALE: cat(aesthetic(aesthetic.color.interior), map(("1",color.red),
("2",color.blue)))
  GUIDE: text.title(label("Chart xyz\nMeasurments by Treatment"))
  GUIDE: axis(dim(1), label("Time points"))
  GUIDE: axis(dim(2), label("Some Scale"))
  SCALE: linear(dim(2), min(0.0), max(8.0))
  ELEMENT: line(position(Index1*trans1), split(id1), color(Medi))
  ELEMENT: point(position(Index1*trans1), split(id1), label(P01_pat),
color(Medi))
PAGE: end()
END GPL.




*******************************
la volta statistics
Christian Schmidhauser, Dr.phil.II
Weinbergstrasse 108
Ch-8006 Zürich
Tel: +41 (043) 233 98 01
Fax: +41 (043) 233 98 02
email: mailto:[hidden email]
internet: http://www.lavolta.ch/
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