Jitter in proc template

statsas — Thu, 09 Aug 2018 18:21:14 GMT

Dears,

I'm using SAS 9.4.

I have a problem with jitter option in scatterplot statement within proc template.

I got a strange jittering for group "TRT A".

Bellow my SAS code and output.

Thanks in advance.

proc template;
   define statgraph plot1;
   begingraph;
      ENTRYTITLE  " Title"   ;


     layout datalattice COLUMNVAR=TRTSEQPN / columns=2 rows=1 headerlabeldisplay=value headerlabelattrs=(size=8pt)
            headerlabelattrs=GraphUnicodeText OUTERPAD=0.2 cm columngutter=8
     columnaxisopts=(display=(ticks tickvalues LABEL)  LABEL="xx" TICKVALUEATTRS= (family = "Arial" size = 7pt)
             type=discrete OFFSETMIN=0.15 OFFSETMAX=0.15) 
     rowaxisopts =(display=(ticks tickvalues LABEL) type=log 
            logopts=(BASE=2 Thresholdmax=1 Thresholdmin=1 MINORTICKS =TRUE MINORGRID=TRUE) 
            labelattrs=GraphUnicodeText labelattrs=(size=7pt) LABEL="y"  griddisplay=on )
     INSET=(nbc) insetopts=(autoalign=(topleft) CONTENTDISPLAY=VALUE DATASCHEME=Matched);
      layout prototype;
      SCATTERPLOT X=vis Y=aval/ group=TRTSEQPN MARKERATTRS=(size=8 ) jitter=auto JITTEROPTS=(width=0.50 );
  

      endlayout;


      endlayout;
   endgraph;
   end;
 quit;

proc format;
  value trtf 1="trt A"
             2="trt B";
Run;

proc sgrender data=im03 template=plot1 ; 
FORMAT  TRTSEQPN trtf. ;
run;

Re: Jitter in proc template

ballardw — Fri, 10 Aug 2018 16:53:01 GMT

Since the markers are jittered then you will have to describe just what the actual "problem" is.

I suspect that you have an expected appearance but you don't say what that would be.

This from the documentation on the WIDTH option for JITTEROPTS may apply:

Note	For a discrete axis, this option has effect only when the markers cannot be clustered side-by-side without overlapping. When WIDTH= is set to a value that is sufficient to eliminate marker overlap in that case, increasing the value further has no effect.

You have specified the x axis as discrete. If your issue is the odd vertical dispersion of markers I suspect the procedure is attempting to avoid overlapping the markers in both vertical and horizontal. Also o character has more area for overlapping than + so things move further apart to avoid the overlap.

And without any data we can't test your code for modification. From your display I would guess that Trt A has more records with similar Y values.

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Jitter in proc template

Re: Jitter in proc template