Data visualization with SAS programming

SGPlot axes through origin with negative data

Accepted Solution Solved
Reply
Frequent Contributor
Posts: 136
Accepted Solution

SGPlot axes through origin with negative data

I'm creating a scatterplot using sgplot. My points have both positive and negative values. I would like to draw two axes through (0,0), but keep the axis labels at the edge of the graph. What's the best way to do this? (I know I can use lineparm, but I'm hoping there is a simpler option).


Accepted Solutions
Solution
‎01-19-2016 05:56 AM
SAS Super FREQ
Posts: 3,910

Re: SGPlot axes through origin with negative data

Posted in reply to BruceBrad
REFLINE 0 / axis=x;

REFLINE 0 / axis=y;



That draws the reference lines, but leaves the axes automatically positioned.


View solution in original post


All Replies
Solution
‎01-19-2016 05:56 AM
SAS Super FREQ
Posts: 3,910

Re: SGPlot axes through origin with negative data

Posted in reply to BruceBrad
REFLINE 0 / axis=x;

REFLINE 0 / axis=y;



That draws the reference lines, but leaves the axes automatically positioned.


Frequent Contributor
Posts: 136

Re: SGPlot axes through origin with negative data

Many thanks. That solves my current problem. For future reference (if I want to present this data differently) how do I get the axes with tickmarks and labels to go through (0,0)?

SAS Super FREQ
Posts: 3,910

Re: SGPlot axes through origin with negative data

Posted in reply to BruceBrad

I'll let someone else advice as to how it might be accomplished.  In my opinion, you shouldn't do it. The center of the plot should be reserved for the data, with the axis ticks, values, and labels positioned to the outside. This is based on basic principles of graphing (a la Tufte) which state that the data should be presented as purely and unadorned as possible.

SAS Super FREQ
Posts: 3,910

Re: SGPlot axes through origin with negative data

Posted in reply to BruceBrad

Another thought: To obtain a whole grid of reference lines, where each line is aligned with axes ticks, use the GRID option on the XAXIS and YAXIS statements, like this:

 

xaxis grid;
yaxis grid;

That gives you all of the advantages of axes that cut through the plot area, but keeps the tick values and labels on the outside of the plot area.

 

SAS Super FREQ
Posts: 1,227

Re: SGPlot axes through origin with negative data

[ Edited ]
Posted in reply to BruceBrad

I don't think there is a way to do this in SGPLOT.  However, you can do this using GTL.

In your case, your data would span across (0, 0), and you would set the x and y origins at zero.

 

Axis_Origin.png

 

proc template;
  define statgraph class;
    begingraph;
      entrytitle 'Weight by Height for all Students';
      layout overlay / xaxisopts=(linearopts=(origin=60))
                               yaxisopts=(linearopts=(origin=100));
        scatterplot x=height y=weight / group=sex name='a';
        discretelegend 'a';
      endlayout;
    endgraph;
  end;
run;


proc sgrender data=sashelp.class template=class;
run;

🔒 This topic is solved and locked.

Need further help from the community? Please ask a new question.

Discussion stats
  • 5 replies
  • 571 views
  • 1 like
  • 3 in conversation